Each license specifies the volume of imports allowed, and the total volume allowed should not exceed the quota. Licenses can be sold to importing companies at a competitive price, or simply a set fee. However, it is argued that this allocation method provides incentives for political lobbying and bribery. Governments may put certain restrictions on what is imported as well as the amount of imported goods and services. For example, if a business wishes to import agricultural products such as vegetables, then the government may be concerned about the impact of such importations of the local market and thus impose a restriction.