"Economic Conditions and U.S. National Security in the 1930s and Today" (2009).
“I find it amazing now that my first economics class, taught by Alan Sweezy, used John Maynard Keynes’s General Theory of Income and Employment as the textbook. Although this book is one of the most influential works of the twentieth century, it makes a really lousy textbook. Moreover, since I now regard Keynes’s analysis as seriously flawed, it is surprising that I enjoyed the course so much. As a student, I appreciated the simple way that the Keynesian model explained the workings and failings of the overall economy. Especially appealing were the clever policy remedies, such as increased government spending and tax cuts, that Keynes recommended to combat unemployment. Too bad that I discovered later that the model was theoretically and empirically deficient!”
Source: Nothing Is Sacred (2002), p. xiii
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Robert Barro 18
American classical macroeconomist 1944Related quotes

N. Gregory Mankiw, "What Would Keynes Have Done?" in New York Times (November 28, 2008).
2000s -
David Warsh, "The Enormous Black Box" http://www.economicprincipals.com/issues/2009.12.13/841.html (2009)
Source: 1950s, The Skills of the Economist, 1958, p. 19
Hayek's Journey: The Mind of Friedrich Hayek (2003)

Edmund Phelps "Keynes had no sure cure for slumps."in: The Financial Times. Columbia University, November 4, 2008.

"Price Flexibility and Output Stability: An Old Keynesian View" (1993)

As quoted in Opinion Journal (22 July 2006) http://www.opinionjournal.com/editorial/feature.html?id=110008690

"Who Was Milton Friedman?", The New York Review of Books (February 15, 2007)
The New York Review of Books articles
Hayek's Journey: The Mind of Friedrich Hayek (2003)