The ideas of the English economist John Maynard Keynes, 1883-1946, achieved their greatest influence during the 1960s and early 1970s. In those days, Keynes was widely credited by his followers among the economists for saving capitalism itself.
The story told by the Keynesian economists went something like this. In the dark days of the Depression of the 1930s, capitalism to all appearances was approaching the end of its road. When the Depression began, the traditional liberal economists, who had long dominated the economics profession, claimed that capitalism would quickly recover from depression without government intervention. Therefore, these economists urged the government to do virtually nothing to encourage economic recovery.
After all, the traditional economists argued, this had always worked in the past. Recovery had always followed recession. But the Depression of the 1930s, the story goes, was different. The economy was showing no signs of recovering on its own. As a result, many young people, including a certain number from the ruling capitalist class itself, were turning toward Marxist ideas. The replacement of capitalism by socialism seemed increasingly likely in the near future.
A Critique of Crisis Theory 