Adam Smith was a Scottish economist and philosopher who is considered the father of modern economics. He wrote two seminal books, "The Theory of Moral Sentiments" and "An Inquiry into the Nature and Causes of the Wealth of Nations." In his first book, Smith discusses how human beings are motivated by both egoism and a sense of moral obligation. In his second book, Smith discusses how the commercial practices of his contemporaries in Scotland led to the development of capitalism. Smith's theories about the natural propensity to trade and the role of competition in the market economy are still studied and debated today.