 We can helpfully explicate neoliberalism by examining the political concepts, principles, and policies shared by three twentieth century political economists: F. A. Hayek, Milton Friedman, and James Buchanan. While they were trained as economists, all three wrote in political theory, and Hayek and Buchanan did so extensively. Identifying the common themes in their work provides an accurate and illuminating picture of neoliberalism as a philosophical doctrine.