Don Boudreaux, of George Mason University, talks with EconTalk host Russ Roberts about the microfoundations of macroeconomics and the Austrian theory of business cycles. Boudreaux draws on Erik Lindahl's distinction between microeconomics and macroeconomics, emphasizing the difference between individual choices and the coordination of economic activity. Other topics include the Austrian view of capital and investment, the Austrian view of monetary policy, the issue of aggregation, and the intellectual successes of the Keynesians.