He is a regular commentator on business and economics for National Public Radio's Morning Edition,[12] and has written for The New York Times and The Wall Street Journal.

[13] Roberts blogs at Cafe Hayek[14] with Donald J. Boudreaux at George Mason University in Fairfax County, Virginia.

[16] One of the most widely watched videos is Fear the Boom and Bust, a rap battle between 20th century economists John Maynard Keynes and Friedrich von Hayek.

[19] In 2008, Roberts released another novel, The Price of Everything: A Parable of Possibility and Prosperity, which focuses on the experiences of Ramon Fernandez, a university student and star tennis player who, as a child, accompanied his mother to the U.S. after she fled from Fidel Castro's Cuba.

"[23] Roberts generally opposes Keynesian economics—particularly stimulus spending—saying that "it's very hard to argue in logical terms that spending money unwisely is the way to get wealthy.

"[26] In subsequent posts, the two economists disagreed on many things, but neither one contested one central idea: Krugman was content to be characterized as a Keynesian,[27] while Roberts was not.