“The usual and basic Keynesian answer to recessions is a monetary expansion. But Keynes worried that even this might sometimes not be enough, particularly if a recession had been allowed to get out of hand and become a true depression. Once the economy is deeply depressed, households and especially firms may be unwilling to increase spending no matter how much cash they have, they may simply add any monetary expansion to their board. Such a situation, in which monetary policy has become ineffective, has come to be known as a "liquidity trap"; Keynes believed that the British and American economies had entered such a trap by the mid-1930s, and some economists believed that the United States was on the edge of such a tap in 1992.
The Keynesian answer to a liquidity trap is for the government to do what the private sector will not: spend. When monetary expansion is ineffective, fiscal expansion—such as public works programs financed by borrowing—must take its place. Such a fiscal expansion can break the vicious circle of low spending and low incomes, "priming the pump: and getting the economy moving again. But remember that this is not by any means an all-purpose policy recommendation; it is essentially a strategy of desperation, a dangerous drug to be prescribed only when the usual over-the-counter remedy of monetary policy has failed.”

— Paul Krugman , book Peddling Prosperity

Source: Peddling Prosperity (1994), Ch. 1 : The Attack on Keynes

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American economist 1953

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“At best, in such depression times, monetary policy is a feeble reed on which to lean.”

John Kenneth Galbraith book The Great Crash, 1929

Source: The Great Crash, 1929 (1954 and 1997 https://openlibrary.org/books/OL25728842M/The_Great_Crash_1929), Chapter X, Cause and Consequence, p. 190

“In fact, the only person to rival Friedman for policy influence in the twentieth century is John Maynard Keynes, who had a strikingly different view of the role of government. Keynes was influential because he advocated more government intervention into what he perceived as poorly functioning private economies caught up in the Great Depression. In contrast to Keynes, Friedman put the main blame for the Depression on government failures, especially of monetary policy. Hence, the Depression did not make Friedman a fan of big government. He also found in the Federal Reserve’s failure to prevent deflation an argument in favor of monetary rules. As the world evolved— with low inflation becoming the major mission of central banks and free markets and secure property rights becoming the main policies to promote economic growth—Friedman surely won the intellectual battle.”

Robert Barro (1944) American classical macroeconomist

Source: Nothing Is Sacred (2002), p. 2

“There is no doubt, and in this I agree with Milton Friedman, that once the Crash had occurred, the Federal Reserve System pursued a silly deflationary policy. I am not only against inflation but I am also against deflation! So, once again, a badly programmed monetary policy prolonged the depression! So, once again, a badly programmed monetary policy prolonged the depression. One consequence of this policy was, of course, the fact that confidence was destroyed.”

Friedrich Hayek (1899–1992) Austrian and British economist and Nobel Prize for Economics laureate

1960s–1970s, A Conversation with Professor Friedrich A. Hayek (1979)

“In effect, Japan in the Nineties offered a fresh opportunity to test the views of Friedman and Keynes regarding the effectiveness of monetary policy in depression conditions. And the results clearly supported Keynes’s pessimism rather than Friedman’s optimism.”

Paul Krugman (1953) American economist

"Who Was Milton Friedman?", The New York Review of Books (February 15, 2007)
The New York Review of Books articles

“People say monetary policy is easy and quick to implement. It can even be done overnight on the telephone, they say fiscal policy drags out in political and congressional debate in our country. It might take months to implement. But the point is that once fiscal policy is implemented, it might go to work much faster than monetary policy.”

Lawrence Klein (1920–2013) American economist

"Keynsianism Again: Interview with Lawrence Klein", Challenge (May-June 2001)

“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.”

John Kenneth Galbraith (1908–2006) American economist and diplomat

Booknotes interview (1994)

“At home, as well as abroad, there is paralyzing uncertainty among business men as to whether the Reserve Board will allow that expansion of bank credit without which such prosperity as we have had in recent years simply cannot last. In short, the Board has created a state of mind which breeds business depression.”

William Trufant Foster (1879–1950) American economist

Foster and Catchings, in: The Atlantic Monthly, Vol. 144, (1929), p. 102; cited in: William J. Barber. From New Era to New Deal. 1988, p. 77.

“In the large sense the primary cause of the Great Depression was the war of 1914-1918. Without the war there would have been no depression of such dimensions. There might have been a normal cyclical recession; but, with the usual timing, even that readjustment probably would not have taken place at that particular period, nor would it have been a "Great Depression."”

Herbert Hoover (1874–1964) 31st President of the United States of America

Source: The Memoirs of Herbert Hoover: The Great Depression, 1929-1941 (1952), p. 2: Lead paragraph Chapter 1 : The origins of the Depression.

“Balancing fiscal and monetary policies is a problem. If you do just one thing, it is not necessarily enough—neither monetary policy alone nor fiscal policy alone, and neither tax cuts nor expenditure increases alone. You need to mix policy. By having the right balance, you can get high employment and stable prices.”

Lawrence Klein (1920–2013) American economist

"Keynsianism Again: Interview with Lawrence Klein", Challenge (May-June 2001)

“I would summarize the Keynesian view in terms of four points:1. Economies sometimes produce much less than they could, and employ many fewer workers than they should, because there just isn’t enough spending. Such episodes can happen for a variety of reasons; the question is how to respond.
2. There are normally forces that tend to push the economy back toward full employment. But they work slowly; a hands-off policy toward depressed economies means accepting a long, unnecessary period of pain.
3. It is often possible to drastically shorten this period of pain and greatly reduce the human and financial losses by “printing money”, using the central bank’s power of currency creation to push interest rates down.
4. Sometimes, however, monetary policy loses its effectiveness, especially when rates are close to zero. In that case temporary deficit spending can provide a useful boost. And conversely, fiscal austerity in a depressed economy imposes large economic losses.”

Paul Krugman (1953) American economist

Keynesianism Explained http://krugman.blogs.nytimes.com/2015/09/15/keynesianism-explained (September 15, 2015)
The Conscience of a Liberal blog

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