The goal of economics should be to accurately describe human action. The point of the supply and demand graphs we pick up in ECON 101 is to demonstrate how prices affect consumption. Economics teaches us about the concepts of marginal cost versus marginal benefit and explains why we are limited in our ability to control the outcomes of society. Much of economics today is about the various policies societies can enact to maximize social welfare and describing ways in which the market fails to function. Public choice is the use of economic tools to deal with traditional problems of political science, especially game theory, with the unit of analysis being individuals.