Milton Friedman was an American economist and an advocate for free markets. He was a libertarian philosophically, but a Republican for expediency. He said, "I think the term classical liberal is equally applicable. I don't really care very much what I'm called. I'm much more interested in having people thinking about the ideas, rather than the person." (Classical liberalism is a political ideology, a branch of liberalism which advocates civil liberties and political freedom with limited government under the rule of law and emphasizes economic freedom). Friedman wrote Capitalism and Freedom in 1962, and was one of the most influential economists of the 20th century. He died at the age of 94 in 2006.