There are wide varieties of economic inequality
, most notably measured using the distribution of income
(the amount of money people are paid) and the distribution of wealth
(the amount of wealth people own). Besides economic inequality between countries or states, there are important types of economic inequality between different groups of people.
Differences in national income equality around the world as measured by the national Gini coefficient
as of 2018.
The Gini coefficient is a number between 0 and 100, where 0 corresponds with perfect equality (where everyone has the same income) and 100 corresponds with absolute inequality (where one person has all the income, and everyone else has zero income).
Wealth disparity in major cities
Research suggests that greater inequality hinders economic growth, and that land and human capital
inequality reduce growth more than inequality of income.
Whereas globalization has reduced global inequality (between nations), it has increased inequality within nations.
Research has generally linked economic inequality to political instability, including democratic breakdown
and civil conflict.
Share of income of the top 1% for selected developed countries, 1975 to 2015
In 1820, the ratio between the income of the top and bottom 20 percent of the world's population was three to one. By 1991, it was eighty-six to one.
A 2011 study titled "Divided we Stand: Why Inequality Keeps Rising" by the Organisation for Economic Co-operation and Development
(OECD) sought to explain the causes for this rising inequality by investigating economic inequality in OECD countries; it concluded that the following factors played a role:
- Changes in the structure of households can play an important role. Single-headed households in OECD countries have risen from an average of 15% in the late 1980s to 20% in the mid-2000s, resulting in higher inequality.
- Assortative mating refers to the phenomenon of people marrying people with similar background, for example doctors marrying other doctors rather than nurses. OECD found out that 40% of couples where both partners work belonged to the same or neighbouring earnings deciles compared with 33% some 20 years before.
- In the bottom percentiles, number of hours worked has decreased.
- The main reason for increasing inequality seems to be the difference between the demand for and supply of skills.
The study made the following conclusions about the level of economic inequality:
- Income inequality in OECD countries is at its highest level for the past half century. The ratio between the bottom 10% and the top 10% has increased from 1:7 to 1:9 in 25 years.
- There are tentative signs of a possible convergence of inequality levels towards a common and higher average level across OECD countries.
- With very few exceptions (France, Japan, and Spain), the wages of the 10% best-paid workers have risen relative to those of the 10% lowest paid.
A 2011 OECD study investigated economic inequality in Argentina
and South Africa
. It concluded that key sources of inequality in these countries include "a large, persistent informal sector
, widespread regional divides (e.g. urban-rural), gaps in access to education, and barriers to employment and career progression for women."
Countries by total wealth (trillions USD), Credit Suisse
A study by the World Institute for Development Economics Research at United Nations University
reports that the richest 1% of adults alone owned 40% of global assets in the year 2000. The three richest people
in the world possess more financial assets than the lowest 48 nations combined.
The combined wealth of the "10 million dollar millionaires" grew to nearly $41 trillion in 2008. Oxfam
's 2021 report on global inequality said that the COVID-19 pandemic
has increased economic inequality substantially; the wealthiest people across the globe were impacted the least by the pandemic and their fortunes recovered quickest, with billionaires seeing their wealth increase by $3.9 trillion, while at the same time those living on less than $5.50 a day likely increased by 500 million. The report also emphasized that the wealthiest 1% are by far the biggest polluters and main drivers of climate change
, and said that government policy should focus on fighting both inequality and climate change simultaneously.
According to PolitiFact
, the top 400 richest Americans "have more wealth than half of all Americans combined."
According to The New York Times
on July 22, 2014, the "richest 1 percent in the United States now own more wealth than the bottom 90 percent".Inherited wealth
may help explain why many Americans who have become rich may have had a "substantial head start".
A 2017 report by the IPS said that three individuals, Jeff Bezos
, Bill Gates
and Warren Buffett
, own as much wealth as the bottom half of the population, or 160 million people, and that the growing disparity between the wealthy and the poor has created a "moral crisis", noting that "we have not witnessed such extreme levels of concentrated wealth and power since the first gilded age
a century ago."
In 2016, the world's billionaires increased their combined global wealth to a record $6 trillion.
In 2017, they increased their collective wealth to 8.9 trillion.
In 2018, U.S. income inequality reached the highest level ever recorded by the Census Bureau
The existing data and estimates suggest a large increase in international (and more generally inter-macroregional) components between 1820 and 1960. It might have slightly decreased since that time at the expense of increasing inequality within countries.
The United Nations Development Programme
in 2014 asserted that greater investments in social security, jobs and laws that protect vulnerable populations are necessary to prevent widening income inequality.
There is a significant difference in the measured wealth distribution and the public's understanding of wealth distribution. Michael Norton of the Harvard Business School
and Dan Ariely of the Department of Psychology at Duke University
found this to be true in their research conducted in 2011. The actual wealth going to the top quintile in 2011 was around 84%, whereas the average amount of wealth that the general public estimated to go to the top quintile was around 58%.
According to a 2020 study, global earnings inequality has decreased substantially since 1970. During the 2000s and 2010s, the share of earnings by the world's poorest half doubled.
Two researchers claim that global income inequality is decreasing due to strong economic growth in developing countries.
According to a January 2020 report by the United Nations Department of Economic and Social Affairs
, economic inequality between states had declined, but intra-state inequality has increased for 70% of the world population
over the period 1990–2015.
In 2015, the OECD reported in 2015 that income inequality is higher than it has ever been within OECD member nations and is at increased levels in many emerging economies.
According to a June 2015 report by the International Monetary Fund
Widening income inequality is the defining challenge of our time. In advanced economies, the gap between the rich and poor is at its highest level in decades. Inequality trends have been more mixed in emerging markets and developing countries (EMDCs), with some countries experiencing declining inequality, but pervasive inequities in access to education, health care, and finance remain.
In October 2017, the IMF warned that inequality within nations, in spite of global inequality falling in recent decades, has risen so sharply that it threatens economic growth and could result in further political polarization
. The Fund's Fiscal Monitor report said that "progressive taxation and transfers are key components of efficient fiscal redistribution."
In October 2018 Oxfam
published a Reducing Inequality Index
which measured social spending, tax and workers' rights to show which countries were best at closing the gap between the rich and the poor.
Wealth distribution within individual countries
The following table shows information about individual wealth distribution in different countries from a 2018 report by Crédit Suisse
is calculated by various factor, for instance: liabilities, debts, exchange rates
and their expected development, real estate prices, human resources
, natural resources
and technical advancements etc.
Median and mean wealth per adult, in US dollars. Countries and subnational
Initially in rank order by median wealth.
Income distribution within individual countries
Countries' income inequality according to their most recent reported Gini index
values as of 2018.
Income inequality is measured by Gini coefficient
(expressed in percent %) that is a number between 0 and 1. Here 0 expresses perfect equality, meaning that everyone has the same income, whereas 1 represents perfect inequality, meaning that one person has all the income and others have none. A Gini index
value above 50% is considered high; countries including Brazil, Colombia, South Africa, Botswana, and Honduras can be found in this category. A Gini index value of 30% or above is considered medium; countries including Vietnam, Mexico, Poland, the United States, Argentina, Russia and Uruguay can be found in this category. A Gini index value lower than 30% is considered low; countries including Austria, Germany, Denmark, Norway, Slovenia, Sweden, and Ukraine can be found in this category.
In the low income inequality category (below 30%) is a wide representation of countries previously being part of Soviet Union or its satellites, like Slovakia, Czech Republic, Ukraine and Hungary.
In 2012 the Gini index for income inequality for whole European Union was only 30.6%.
Income distribution can differ from wealth distribution within each country. The wealth inequality is also measured in Gini index. There the higher Gini index signify greater inequality within the wealth distribution in country, 0 means total wealth equality and 1 represents situation, where everyone has no wealth, except an individual that has everything. For instance countries like Denmark, Norway and Netherlands, all belonging to the last category (below 30%, low income inequality) also have very high Gini index in wealth distribution, ranging from 70% up to 90%.
Various proposed causes of economic inequality There are various reasons for economic inequality within societies, including both global market functions (such as trade, development, and regulation) as well as social factors (including gender, race, and education).
Recent growth in overall income inequality, at least within the OECD countries, has been driven mostly by increasing inequality in wages and salaries.
Economist Thomas Piketty
argues that widening economic disparity is an inevitable phenomenon of free market capitalism
when the rate of return of capital (r) is greater than the rate of growth of the economy (g).
A major cause of economic inequality within modern market economies
is the determination of wages by the market
. Where competition is imperfect; information unevenly distributed; opportunities to acquire education and skills unequal; market failure
results. Since many such imperfect conditions exist in virtually every market, there is in fact little presumption that markets are in general efficient. According to Joseph Stiglitz
this means that there is an enormous potential role for government to correct such market failures. In his book, The Price of Inequality
published in 2012,
Stiglitz argues that the economical inequality is inevitable and permanent, because it is caused by the great amount of political power the richest have. 
"While there may be underlying economic forces at play, politics have shaped the market, and shaped it in ways that advantage the top at the expense of the rest.”- The Price of Inequality
Thomas Malthus was originally a demographer, but later in his life he focused on studying economy, mainly inequalities across population. In his work he raised questions related to population growth and economy. In his Essay on Principle of Population, published in 1798, Thomas Malthus
claims that the population grows at geometrical speed, but the resources can only grow at arithmetical speed. In his theory, also referred to as Malthusianism
, he explains that whenever there is spare food or resources, the population will grow faster to fulfill the gap.
"The happiness of a country does not depend, absolutely, upon its poverty, or its riches, upon its youth, or its age, upon its being thinly, or fully inhabited, but upon the rapidity with which it is increasing, upon the degree in which the yearly increase of food approaches to the yearly increase of an unrestricted population."
- An Essay on the Principle of Population
The malthusian argument could be described as "Despite the population getting bigger, the quality of life will not increase". Even with new technologies and more effective ways of providing resources, the population will grow to the size at which the quality is the same as before per capita. This would lead to the point at which there would be not enough food for everyone, cause great famine or war for resources among the people and potentially die out of the whole population. This event is called Malthusian catastrophe and causes reduction of population back to the sustainable level.
In his theory, Malthus uses “checks” - terms describing the limiting factors of the population size at any time. He divided them into 2 groups: the preventive checks and the positive checks.
A preventive check is a conscious decision to abstain from procreation based on material or spiritual belief, for example a lack of resources or sex abstinence. Malthus explained this by his statement that people are perceiving the possible consequences of uncontrolled population growth and so wouldn’t knowingly contribute to that.
A positive check is, on the other hand, any event that shortens the human life span, for example war, diseases or famine. This also includes poor financial or health situation. The Malthusian catastrophe occurs when the rate of early death is too high in the population
Another cause is the rate at which income is taxed
coupled with the progressivity of the tax system. A progressive tax
is a tax by which the tax rate
increases as the taxable base amount increases.
In a progressive tax system, the level of the top tax rate will often have a direct impact on the level of inequality within a society, either increasing it or decreasing it, provided that income does not change as a result of the change in tax regime. Additionally, steeper tax progressivity applied to social spending can result in a more equal distribution of income
across the board.
Tax credits such as the Earned Income Tax Credit
in the US can also decrease income inequality.
The difference between the Gini index
for an income distribution before taxation and the Gini index after taxation is an indicator for the effects of such taxation.
Illustration from a 1916 advertisement for a vocational school in the back of a US magazine. Education has been seen as a key to higher income, and this advertisement appealed to Americans' belief in the possibility of self-betterment, as well as threatening the consequences of downward mobility in the great income inequality
existing during the Industrial Revolution
An important factor in the creation of inequality is variation in individuals' access to education.
Education, especially in an area where there is a high demand for workers, creates high wages for those with this education.
However, increases in education first increase and then decrease growth as well as income inequality. As a result, those who are unable to afford an education, or choose not to pursue optional education, generally receive much lower wages. The justification for this is that a lack of education leads directly to lower incomes, and thus lower aggregate saving and investment. Conversely, quality education
raises incomes and promotes growth because it helps to unleash the productive potential of the poor.
Economic liberalism, deregulation and decline of unions
John Schmitt and Ben Zipperer (2006) of the CEPR point to economic liberalism
and the reduction of business regulation
along with the decline of union membership
as one of the causes of economic inequality. In an analysis of the effects of intensive Anglo-American liberal
policies in comparison to continental European liberalism, where unions have remained strong, they concluded "The U.S. economic and social model is associated with substantial levels of social exclusion, including high levels of income inequality, high relative and absolute poverty rates, poor and unequal educational outcomes, poor health outcomes, and high rates of crime and incarceration. At the same time, the available evidence provides little support for the view that U.S.-style labor market flexibility
dramatically improves labor-market outcomes. Despite popular prejudices to the contrary, the U.S. economy consistently affords a lower level of economic mobility than all the continental European countries for which data is available."
More recently, the International Monetary Fund
has published studies which found that the decline of unionization in many advanced economies and the establishment of neoliberal
economics have fueled rising income inequality.
The growth in importance of information technology
has been credited with increasing income inequality.
Technology has been called "the main driver of the recent increases in inequality" by Erik Brynjolfsson, of MIT
In arguing against this explanation, Jonathan Rothwell notes that if technological advancement is measured by high rates of invention, there is a negative correlation between it and inequality. Countries with high invention rates — "as measured by patent applications filed under the Patent Cooperation Treaty" — exhibit higher inequality than those with less. In one country, the United States, "salaries of engineers and software developers rarely reach" above $390,000/year (the lower limit for the top 1% earners).
Some researchers, such as Juliet B. Schor, highlight the role of for-profit online sharing economy platforms as an accelerator of income inequality and calls into question their supposed contribution in empowering outsiders of the labour market.
Taking the example of TaskRabbit, a labour service platform, she shows that a large proportion of providers already have a stable full-time job and participate part-time in the platform as an opportunity to increase their income by diversifying their activities outside employment, which tends to restrict the volume of work remaining for the minority of platform workers.
In addition, there is an important phenomenon of labour substitution as manual tasks traditionally performed by workers without a degree (or just a college degree) integrated into the labour market in the traditional economy sectors are now performed by workers with a high level of education, (in 2013, 70% of TaskRabbit's workforce held a Bachelor's degree, 20% a Master's Degree and 5% a PhD.
The development of platforms, which are increasingly capturing demand for these manual services at the expense of non-platform companies, may therefore benefit mainly skilled workers who are offered more earning opportunities that can be used as supplemental or transitional work during periods of unemployment.
"Elephant curve": Change in real income between 1988 and 2008 at various income percentiles of global income distribution.
may shift economic inequality from a global to a domestic scale.
When rich countries trade with poor countries, the low-skilled workers in the rich countries may see reduced wages as a result of the competition, while low-skilled workers in the poor countries may see increased wages. Trade economist Paul Krugman estimates that trade liberalisation has had a measurable effect on the rising inequality in the United States
. He attributes this trend to increased trade with poor countries and the fragmentation of the means of production
, resulting in low skilled jobs becoming more tradeable.
The gender gap in median earnings of full-time employees according to the OECD
In many countries, there is a gender pay gap
in favor of males in the labor market
. Several factors other than discrimination contribute to this gap. On average, women are more likely than men to consider factors other than pay when looking for work, and may be less willing to travel or relocate. Thomas Sowell
, in his book Knowledge and Decisions
, claims that this difference is due to women not taking jobs due to marriage or pregnancy. A U.S. Census's report stated that in US once other factors are accounted for there is still a difference in earnings between women and men.
A study done on three post-soviet countries Armenia
, and Azerbaijan
reveals that gender is one of the driving forces of income inequality, and being a female have significant negative effect on income, when other factors are held equal. The results show more than 50% gender pay gap in all three countries. 
These findings are because usually employers tend to avoid hiring women because of possible maternity leave. Other reason for this can be occupational segregation
, which implies that women are usually accumulated in lower-paid positions and sectors, such as social services and education.
There is also a globally recognized disparity in the wealth, income, and economic welfare
of people of different races. In many nations, data exists to suggest that members of certain racial demographics experience lower wages, fewer opportunities for career and educational advancement, and intergenerational wealth gaps
Studies have uncovered the emergence of what is called "ethnic capital", by which people belonging to a race that has experienced discrimination are born into a disadvantaged family from the beginning and therefore have less resources and opportunities at their disposal.
The universal lack of education, technical and cognitive skills, and inheritable wealth within a particular race is often passed down between generations, compounding in effect to make escaping these racialized cycles of poverty
Additionally, ethnic groups that experience significant disparities are often also minorities, at least in representation though often in number as well, in the nations where they experience the harshest disadvantage. As a result, they are often segregated either by government policy or social stratification, leading to ethnic communities that experience widespread gaps in wealth and aid.
As a general rule, races which have been historically and systematically colonized (typically indigenous ethnicities) continue to experience lower levels of financial stability in the present day. The global South
is considered to be particularly victimized by this phenomenon, though the exact socioeconomic manifestations change across different regions.
Even in economically developed societies with high levels of modernization
such as may be found in Western Europe, North America, and Australia, minority ethnic groups and immigrant populations in particular experience financial discrimination. While the progression of civil rights movements and justice reform has improved access to education and other economic opportunities in politically advanced nations, racial income and wealth disparity still prove significant.
In the United States for example, a survey[when?]
of African-American populations show that they are more likely to drop out of high school and college, are typically employed for fewer hours at lower wages, have lower than average intergenerational wealth, and are more likely to use welfare as young adults than their white counterparts.
Mexican-Americans, while suffering less debilitating socioeconomic factors than black Americans, experience deficiencies in the same areas when compared to whites and have not assimilated financially to the level of stability experienced by white Americans as a whole.
These experiences are the effects of the measured disparity due to race in countries like the US, where studies show that in comparison to whites, blacks suffer from drastically lower levels of upward mobility
, higher levels of downward mobility, and poverty that is more easily transmitted to offspring as a result of the disadvantage stemming from the era of slavery and post-slavery racism
that has been passed through racial generations to the present.
These are lasting financial inequalities that apply in varying magnitudes to most non-white populations in nations such as the US, the UK, France, Spain, Australia, etc.
In the countries of the Caribbean, Central America, and South America, many ethnicities continue to deal with the effects fo European colonization, and in general nonwhites tend to be noticeably poorer than whites in this region. In many countries with significant populations of indigenous races and those of Afro-descent (such as Mexico, Colombia, Chile, etc.) income levels can be roughly half as high as those experiences by white demographics, and this inequity is accompanied by systematically unequal access to education, career opportunities, and poverty relief. This region of the world, apart from urbanizing areas like Brazil and Costa Rica, continues to be understudied and often the racial disparity is denied by Latin Americans who consider themselves to be living in post-racial and post-colonial societies far removed from intense social and economic stratification despite the evidence to the contrary.
African countries, too, continue to deal with the effects of the Trans-Atlantic Slave Trade
, which set back economic development as a whole for blacks of African citizenship more than any other region. The degree to which colonizers stratified their holdings on the continent on the basis of race has had a direct correlation in the magnitude of disparity experienced by nonwhites in the nations that eventually rose from their colonial status. Former French colonies, for example, see much higher rates of income inequality between whites and nonwhites as a result of the rigid hierarchy imposed by the French who lived in Africa at the time.
Another example is found in South Africa, which, still reeling from the socioeconomic impacts of Apartheid
, experiences some of the highest racial income and wealth inequality in all of Africa.
In these and other countries like Nigeria, Zimbabwe, and Sierra Leone, movements of civil reform have initially led to improved access to financial advancement opportunities, but data[when?]
shows that for nonwhites this progress is either stalling or erasing itself in the newest generation of blacks that seek education and improved transgenerational wealth. The economic status of one's parents continues to define and predict the financial futures of African and minority ethnic groups.[needs update]
Asian regions and countries such as China, the Middle East, and Central Asia have been vastly understudied in terms of racial disparity, but even here the effects of Western colonization provide similar results to those found in other parts of the globe.
Additionally, cultural and historical practices such as the caste system
in India leave their marks as well. While the disparity is greatly improving in the case of India, there still exists social stratification between peoples of lighter and darker skin tones that cumulatively result in income and wealth inequality, manifesting in many of the same poverty traps seen elsewhere.
A Kuznets curve
Economist Simon Kuznets
argued that levels of economic inequality are in large part the result of stages of development
. According to Kuznets, countries with low levels of development have relatively equal distributions of wealth. As a country develops, it acquires more capital, which leads to the owners of this capital having more wealth and income and introducing inequality. Eventually, through various possible redistribution mechanisms such as social welfare
programs, more developed countries move back to lower levels of inequality.
argues that the growing productivity due to advanced technologies results in increasing wages' purchase power for most commodities, which enables employers underpay workers in "labor equivalents", maintaining nevertheless an impression of fair pay. This illusion is dismanteled by the wages' decreasing purchase power for the commodities with a significant share of hand labor. This difference between the appropriate and factual pay goes to enterprise owners and top earners, increasing the inequality.
As of 2019, Jeff Bezos
is the richest person in the world.
Wealth concentration is the process by which, under certain conditions, newly created wealth
concentrates in the possession of already-wealthy individuals or entities. Accordingly, those who already hold wealth have the means to invest
in new sources of creating wealth or to otherwise leverage the accumulation of wealth, and thus they are the beneficiaries of the new wealth. Over time, wealth concentration can significantly contribute to the persistence of inequality within society. Thomas Piketty in his book Capital in the Twenty-First Century
argues that the fundamental force for divergence is the usually greater return of capital (r) than economic growth (g), and that larger fortunes generate higher returns.
According to a 2020 study by the RAND Corporation
, the top 1% of U.S. income earners have taken $50 trillion from the bottom 90% between 1975 and 2018.
Economist Joseph Stiglitz
argues that rather than explaining concentrations of wealth and income, market forces should serve as a brake on such concentration, which may better be explained by the non-market force known as "rent-seeking
". While the market will bid up compensation for rare and desired skills to reward wealth creation, greater productivity, etc., it will also prevent successful entrepreneurs from earning excess profits by fostering competition to cut prices, profits and large compensation.
A better explainer of growing inequality, according to Stiglitz, is the use of political power generated by wealth by certain groups to shape government policies financially beneficial to them. This process, known to economists as rent-seeking
, brings income not from creation of wealth but from "grabbing a larger share of the wealth that would otherwise have been produced without their effort"
argues that countries with larger financial sectors have greater inequality, and the link is not an accident.[why?]
A 2019 study published in PNAS
found that global warming
plays a role in increasing economic inequality between countries, boosting economic growth in developed countries while hampering such growth in developing nations of the Global South
. The study says that 25% of gap between the developed world and the developing world can be attributed to global warming.
A 2020 report by Oxfam
and the Stockholm Environment Institute
says that the wealthiest 10% of the global population were responsible for more than half of global carbon dioxide emissions from 1990 to 2015, which increased by 60%.
According to a 2020 report by the UNEP
by the rich is a significant driver of the climate crisis
, and the wealthiest 1% of the world's population are responsible for more than double the greenhouse gas emissions of the poorest 50% combined. Inger Andersen
, in the foreword to the report, said "this elite will need to reduce their footprint by a factor of 30 to stay in line with the Paris Agreement targets."
Countries with a left-leaning legislature
generally have lower levels of inequality.
Many factors constrain economic inequality – they may be divided into two classes: government sponsored, and market driven. The relative merits and effectiveness of each approach is a subject of debate.
initiatives to reduce economic inequality include:
- Public education: increasing the supply of skilled labor and reducing income inequality due to education differentials.
- Progressive taxation: the rich are taxed proportionally more than the poor, reducing the amount of income inequality in society if the change in taxation does not cause changes in income.
outside of government intervention that can reduce economic inequality include:
propensity to spend
: with rising wealth & income, a person may spend more. In an extreme example, if one person owned everything, they would immediately need to hire people to maintain their properties, thus reducing the wealth concentration
On the other hand, high-income persons have higher propensity to save.
Robin Maialeh then shows that increasing economic wealth decreases propensity to spend and increases propensity to invest which consequently leads to even greater growth rate of already rich agents.
Research shows that since 1300, the only periods with significant declines in wealth inequality in Europe were the Black Death
and the two World Wars.
Historian Walter Scheidel
posits that, since the stone age, only extreme violence, catastrophes and upheaval in the form of total war
, Communist revolution
, pestilence and state collapse have significantly reduced inequality.
He has stated that "only all-out thermonuclear war might fundamentally reset the existing distribution of resources" and that "peaceful policy reform may well prove unequal to the growing challenges ahead."
A lot of research has been done about the effects of economic inequality on different aspects in society:
- Health: For long time the higher material living standards lead to longer life, as those people were able to get enough food, water and access to warmth. British researchers Richard G. Wilkinson and Kate Pickett have found higher rates of health and social problems (obesity, mental illness, homicides, teenage births, incarceration, child conflict, drug use) in countries and states with higher inequality. Their research included 24 developed countries, including most of the states from USA, and found that in the more developed countries, such as Finland and Japan, the heath issues are much lower than in states with rather higher inequality rates, such as Utah and New Hampshire. Some studies link a surge in "deaths of despair", suicide, drug overdoses and alcohol related deaths, to widening income inequality. Conversely, other research did not find these effects or concluded that research suffered from issues of confounding variables.
- Social goods: British researchers Richard G. Wilkinson and Kate Pickett have found lower rates of social goods (life expectancy by country, educational performance, trust among strangers, women's status, social mobility, even numbers of patents issued) in countries and states with higher inequality.
- Social cohesion: Research has shown an inverse link between income inequality and social cohesion. In more equal societies, people are much more likely to trust each other, measures of social capital (the benefits of goodwill, fellowship, mutual sympathy and social connectedness among groups who make up a social units) suggest greater community involvement.
- Crime: The cross national research shows that in societies with less economic inequality the homicide rates are consistently lower. A 2016 study finds that interregional inequality increases terrorism. Other research has argued inequality has little effect on crime rates.
- Welfare: Studies have found evidence that in societies where inequality is lower, population-wide satisfaction and happiness tend to be higher.
- Poverty: Study made by Jared Bernstein and Elise Gould suggest, that the poverty in the USA could has been reduced by the lowering of economic inequality for the past few decades. 
- Debt: Income inequality has been the driving factor in the growing household debt, as high earners bid up the price of real estate and middle income earners go deeper into debt trying to maintain what once was a middle class lifestyle.
- Economic growth: A 2016 meta-analysis found that "the effect of inequality on growth is negative and more pronounced in less developed countries than in rich countries", though the average impact on growth was not significant. The study also found that wealth inequality is more pernicious to growth than income inequality.
- Civic participation: Higher income inequality led to less of all forms of social, cultural, and civic participation among the less wealthy.
- Political instability: Studies indicate that economic inequality leads to greater political instability, including an increased risk of democratic breakdown and civil conflict.
- Political party responses: One study finds that economic inequality prompts attempts by left-leaning politicians to pursue redistributive policies while right-leaning politicians seek to repress the redistributive policies.
According to Christina Starmans et al. (Nature Hum. Beh., 2017), the research literature contains no evidence on people having an aversion on inequality. In all studies analyzed, the subjects preferred fair distributions to equal distributions, in both laboratory and real-world situations. In public, researchers may loosely speak of equality instead of fairness, when referring to studies where fairness happens to coincide with equality, but in many studies fairness is carefully separated from equality and the results are univocal. Already very young children seem to prefer fairness over equality.
When people were asked, what would be the wealth of each quintile in their ideal society, they gave a 50-fold sum to the richest quintile than to the poorest quintile. The preference for inequality increases in adolescence, and so do the capabilities to favor fortune, effort and ability in the distribution.
Preference for unequal distribution has been developed to the human race possibly because it allows for better co-operation and allows a person to work with a more productive person so that both parties benefit from the co-operation. Inequality is also said to be able to solve the problems of free-riders, cheaters and ill-behaving people, although this is heavily debated.
Researches demonstrate that people usually underestimate the level of actual inequality, which is also much higher than their desired level of inequality.
In many societies, such as the USSR, the distribution led to protests from wealthier landowners.
In the current U.S., many feel that the distribution is unfair in being too unequal. In both cases, the cause is unfairness, not inequality, the researchers conclude.
attribute the vast disparities in wealth to the private ownership of the means of production
by a class of owners, creating a situation where a small portion of the population lives off unearned property income
by virtue of ownership titles in capital equipment, financial assets and corporate stock. By contrast, the vast majority of the population is dependent on income in the form of a wage or salary. In order to rectify this situation, socialists argue that the means of production should be socially owned
so that income differentials would be reflective of individual contributions
to the social product.
attributes rising inequality to job automation and capital deepening
within capitalism. The process of job automation conflicts with the capitalist property form and its attendant system of wage labor
. In this analysis, capitalist firms increasingly substitute capital equipment for labor inputs (workers) under competitive pressure to reduce costs and maximize profits. Over the long term, this trend increases the organic composition of capital
, meaning that less workers are required in proportion to capital inputs, increasing unemployment (the "reserve army of labour
"). This process exerts a downward pressure on wages. The substitution of capital equipment for labor (mechanization and automation) raises the productivity of each worker, resulting in a situation of relatively stagnant wages for the working class amidst rising levels of property income
for the capitalist class.
favors an eventual society where an individual's success is a direct function of his merit, or contribution. Economic inequality would be a natural consequence of the wide range in individual skill, talent and effort in human population. David Landes
stated that the progression of Western economic development that led to the Industrial Revolution
was facilitated by men advancing through their own merit rather than because of family or political connections.
Most modern social liberals
, including centrist or left-of-center political groups, believe that the capitalist economic system should be fundamentally preserved, but the status quo regarding the income gap must be reformed. Social liberals favor a capitalist system with active Keynesian
macroeconomic policies and progressive taxation (to even out differences in income inequality). Research indicates that people who hold liberal beliefs tend to see greater income inequality as morally wrong.
The liberal champions of equality under the law were fully aware of the fact that men are born unequal and that it is precisely their inequality that generates social cooperation and civilization. Equality under the law was in their opinion not designed to correct the inexorable facts of the universe and to make natural inequality disappear. It was, on the contrary, the device to secure for the whole of mankind the maximum of benefits it can derive from it. Henceforth no man-made institutions should prevent a man from attaining that station in which he can best serve his fellow citizens.
argued that government redistributes wealth by force (usually in the form of taxation), and that the ideal moral society would be one where all individuals are free from force. However, Nozick recognized that some modern economic inequalities were the result of forceful taking of property, and a certain amount of redistribution would be justified to compensate for this force but not because of the inequalities themselves. John Rawls
argued in A Theory of Justice
that inequalities in the distribution of wealth are only justified when they improve society as a whole, including the poorest members. Rawls does not discuss the full implications of his theory of justice. Some see Rawls's argument as a justification for capitalism
since even the poorest members of society theoretically benefit from increased innovations under capitalism; others believe only a strong welfare state
can satisfy Rawls's theory of justice.
Classical liberal Milton Friedman
believed that if government action is taken in pursuit of economic equality then political freedom would suffer. In a famous quote, he said:
A society that puts equality before freedom will get neither. A society that puts freedom before equality will get a high degree of both.
Economist Tyler Cowen
has argued that though income inequality has increased within nations, globally it has fallen over the 20 years leading up to 2014. He argues that though income inequality may make individual nations worse off, overall, the world has improved as global inequality has been reduced.
Social justice arguments
Patrick Diamond and Anthony Giddens (professors of Economics and Sociology, respectively) hold that 'pure meritocracy
is incoherent because, without redistribution, one generation's successful individuals would become the next generation's embedded caste, hoarding the wealth they had accumulated'.
They also state that social justice
requires redistribution of high incomes and large concentrations of wealth in a way that spreads it more widely, in order to "recognise the contribution made by all sections of the community to building the nation's wealth." (Patrick Diamond and Anthony Giddens
, June 27, 2005, New Statesman)
stated in his Evangelii gaudium
, that "as long as the problems of the poor are not radically resolved by rejecting the absolute autonomy of markets and financial speculation and by attacking the structural causes of inequality, no solution will be found for the world's problems or, for that matter, to any problems."
He later declared that "inequality is the root of social evil."
Effects on social welfare
In most western democracies, the desire to eliminate or reduce economic inequality is generally associated with the political left
. One practical argument in favor of reduction is the idea that economic inequality reduces social cohesion
and increases social unrest
, thereby weakening the society. There is evidence that this is true (see inequity aversion
) and it is intuitive, at least for small face-to-face groups of people. Alberto Alesina
, Rafael Di Tella
, and Robert MacCulloch find that inequality negatively affects happiness
in Europe but not in the United States.
It has also been argued that economic inequality invariably translates to political inequality, which further aggravates the problem. Even in cases where an increase in economic inequality makes nobody economically poorer, an increased inequality of resources is disadvantageous, as increased economic inequality can lead to a power shift due to an increased inequality in the ability to participate in democratic processes.
The capabilities approach – sometimes called the human development approach – looks at income inequality and poverty as form of "capability deprivation".
, which "defines well-being as utility maximization", economic growth and income are considered a means to an end rather than the end itself.
Its goal is to "wid[en] people's choices and the level of their achieved well-being"
through increasing functionings (the things a person values doing), capabilities (the freedom to enjoy functionings) and agency (the ability to pursue valued goals).
When a person's capabilities are lowered, they are in some way deprived of earning as much income as they would otherwise. An old, ill man cannot earn as much as a healthy young man; gender roles
and customs may prevent a woman from receiving an education or working outside the home. There may be an epidemic that causes widespread panic, or there could be rampant violence in the area that prevents people from going to work for fear of their lives.
As a result, income inequality increases, and it becomes more difficult to reduce the gap without additional aid. To prevent such inequality, this approach believes it is important to have political freedom, economic facilities, social opportunities, transparency guarantees, and protective security to ensure that people aren't denied their functionings, capabilities, and agency and can thus work towards a better relevant income.
Policy responses intended to mitigate
No business which depends for existence on paying less than living wages to its workers has any right to continue in this country.
A 2011 OECD study makes a number of suggestions to its member countries, including:
- Well-targeted income-support policies.
- Facilitation and encouragement of access to employment.
- Better job-related training and education for the low-skilled (on-the-job training) would help to boost their productivity potential and future earnings.
- Better access to formal education.
wrote in December 2013: "A minimum wage, providing it is not set too high, could thus boost pay with no ill effects on jobs....America's federal minimum wage, at 38% of median income, is one of the rich world's lowest. Some studies find no harm to employment from federal or state minimum wages, others see a small one, but none finds any serious damage."
General limitations on and taxation of rent-seeking
are popular across the political spectrum.
Public policy responses addressing causes and effects of income inequality in the US include: progressive tax incidence
adjustments, strengthening social safety net
provisions such as Aid to Families with Dependent Children
, the food stamp program
, Social Security
, and Medicaid
, organizing community interest groups
, increasing and reforming higher education
subsidies, increasing infrastructure
spending, and placing limits on and taxing rent-seeking
A 2017 study in the Journal of Political Economy
by Daron Acemoglu
, James Robinson
and Thierry Verdier argues that American "cutthroat" capitalism and inequality gives rise to technology and innovation that more "cuddly" forms of capitalism cannot.
As a result, "the diversity of institutions we observe among relatively advanced countries, ranging from greater inequality and risk-taking in the United States to the more egalitarian societies supported by a strong safety net in Scandinavia, rather than reflecting differences in fundamentals between the citizens of these societies, may emerge as a mutually self-reinforcing world equilibrium. If so, in this equilibrium, 'we cannot all be like the Scandinavians,' because Scandinavian capitalism
depends in part on the knowledge spillovers created by the more cutthroat American capitalism."
A 2012 working paper by the same authors, making similar arguments, was challenged by Lane Kenworthy
, who posited that, among other things, the Nordic countries are consistently ranked as some of the world's most innovative countries by the World Economic Forum
's Global Competitiveness Index
, with Sweden ranking as the most innovative nation, followed by Finland, for 2012–2013; the U.S. ranked sixth.
There are however global initiative like the United Nations Sustainable Development Goal 10
which aims to garner international efforts in reducing economic inequality considerably by 2030.
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