A criticism of transfer payments is that they do not produce outcomes that are economically advantageous. Governments pool taxes and other sources of revenue together and spend the money to further a certain agenda. Some of the spending pays for goods and services, such as buildings, equipment, and government worker salaries. These expenditures are exchanges in which money is traded for something with a recognized value. The payments may be viewed as boosting industrial activity and employment. However, government transfer payments do not boost production or economic activity. For example, foreign aid does not necessarily prompt foreign trade. Additionally, some argue that welfare programs, such as unemployment benefits and social security, reduce incentives to take paid work.