Robert E. Hall and Marc Lieberman, Macroeconomics (2012).
“Broadly speaking, [Keynesianism means] that the government has a specific responsibility for the behavior of the economy, that it doesn't work on its own autonomous course, but the government, when there's a recession, compensates by employment, by expansion of purchasing power, and in boom times corrects by being a restraining force. But it controls the great flow of demand into the economy, what since Keynesian times has been the flow of aggregate demand. That was the basic idea of Keynes so far as one can put it in a couple of sentences.”
Booknotes interview (1994)
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John Kenneth Galbraith 207
American economist and diplomat 1908–2006Related quotes

http://www.columbia.edu/~xs23/keynes/keynes2.htm And this may help explain why.
Xavier Sala-i-Martin, Xavier Sala-i-Martin's Home Page http://www.columbia.edu/~xs23/keynes/keynes1.htm.

1. America's Search for a Public Philosophy
Public Philosophy (2005)

Amartya Sen, "What Happened to Europe?", New Republic (August 2, 2012)
2010s

"John Maynard Keynes: Where’s The Genius?! (Part 2) http://www.economicpolicyjournal.com/2013/08/john-maynard-keynes-wheres-genius-part-2.html Economic Policy Journal, August 23, 2013.
2010s, 2013

"Democracy in Cyberspace," Foreign Affairs (November/December 2010).

Source: John Maynard Keynes: The Return of the Master (2009), Ch. 8 : Keynes for Today