Roger E. Backhouse and Bradley W. Bateman, ch.1 "Keynes Returns, but Which Keynes?" Capitalist revolutionary : John Maynard Keynes (2011).
“If you were going to turn to only one economist to understand the problems facing the economy, there is little doubt that the economist would be John Maynard Keynes. Although Keynes died more than a half-century ago, his diagnosis of recessions and depressions remains the foundation of modern macroeconomics. His insights go a long way toward explaining the challenges we now confront.”
N. Gregory Mankiw, "What Would Keynes Have Done?" in New York Times (November 28, 2008).
2000s -
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N. Gregory Mankiw 16
American economist 1958Related quotes
David Warsh, "The Enormous Black Box" http://www.economicprincipals.com/issues/2009.12.13/841.html (2009)

Source: John Maynard Keynes: 1883-1946: Economist, Philosopher, Statesman (2003), Ch. 27. Portraits of an Unusual Economist

Edmund Phelps "Keynes had no sure cure for slumps."in: The Financial Times. Columbia University, November 4, 2008.
Robert E. Hall and Marc Lieberman, Macroeconomics (2012).

Source: Debunking Economics - The Naked Emperor Of The Social Sciences (2001), Chapter 1, No More Mister Nice Guy, p. 2