Adam Smith is a man that has contributed more to modern economics than many people understand, but if you ask any college student learning about the principles of Microeconomics and Macroeconomics they will definitely have heard of his theory of economics known as the "Invisible hand". This theory states that people operate in their self interest which can have unintended social benefits while doing what best serves their individual need. Smith did not only participate in economics, he was also a philosopher and author. Smith wrote two wildly successful books in his time "The Theory of Moral Sentiments" and "The Wealth of Nations", both books expanded on the idea of what motivates people to make the decisions that they choose and how political policy is impacted by the economy. Overall Adam Smith is an economist giant that will not soon be forgotten.