By the influence of Keynes requirements of the management theory, people promote the economic growth function mechanism to the tax cut only in its demand effect, but not in its supplies effect.

受凯恩斯需求管理理论的影响，人们对减税促进经济增长的作用机制只重视其需求效应，而不重视其供给效应。

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He might be the grandfather of activist government, but Keynes also said, in effect, that you should never think you have it covered, that you've abolished boom and bust.

BBC: Masters of money: John Maynard Keynes

This, in effect, is the argument that Hayek made against Keynes in the late 1920s and 1930s: he said the Fed caused the crash, by keeping interest rates too low and encouraging a lot of "malinvestment" - investment in projects or assets which were not economically worthwhile.

BBC: Masters of Money: Friedrich Hayek