I believe that Keynes was completely in the right as the concept of full employment would mean actively neglecting involuntary unemployment, which was the reality of thousands globally. This, though seemingly a very obvious observation, was not so obvious during his time. There exist millions of workers who are prepared to work at a given wage rate and even below it, but fail to find work, often due to changes in the business cycle. The capitalist structure of society is characterized by such involuntary unemployment, which the classicists conveniently and completely ignored.
As emphasized priorly, Keynesians staunchly believe in activist policies to reduce the amplitude of the business cycle. According to Keynes, the business cycle is the root of all economic evils and is the most important of all economic problems. To tackle this, Keynes advocated for countercyclical fiscal policies that act against the direction of the business cycle. For example, deficit spending on labor-intensive infrastructure projects to stimulate employment and stabilize wages during periods of economic downturns. In a situation of abundant demand-side growth, Keynesians would lobby for raising taxes to cool the economy and prevent inflation. They also rely on monetary policies in certain situations (minus periods of liquidity trap) to stimulate the economy, like reducing interest rates to encourage investments.

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