Compare classical and Keynesian unemployment?
Answer:
Classical unemployment
In this case, like that of cyclical unemployment, the number of job-seekers exceeds the number of vacancies. However, the problem here is not aggregate demand failure. In this situation, real wages are higher than the market-equilibrium wage. In simple terms, institutions such as "the minimum wage" deter employers from hiring all of the available workers, because the cost would exceed the technologically-determined benefit of hiring them (the marginal product of labor). Some economists theorize that this type of unemployment can be reduced by increasing the flexibility of wages (e.g., abolishing minimum wages or employee protection), to make the labor market more like a financial market.
Conversely, making wages more flexible allows employers who are adequately staffed to pay less with no corresponding benefit to job-seekers. If one accepts that people with low incomes spend their money rapidly (out of necessity), more flexible wages may increase unemployment in the short term.
Keynesian Unemployment
During the Great Depression, the classical theory defined economic collapse as simply a lost incentive to produce. Mass unemployment was caused only by high and rigid real wages. The proper solution was to cut wages.
To Keynes, the determination of wages is more complicated. First, he argued that it is not real but nominal wages that are set in negotiations between employers and workers, as opposed to a barter relationship. First, nominal wage cuts would be difficult to put into effect because of laws and wage contracts. Even classical economists admitted that these exist; unlike Keynes, they advocated abolishing minimum wages, unions, and long-term contracts, increasing labor-market flexibility. However, to Keynes, people will resist nominal wage reductions, even without unions, until they see other wages falling and a general fall of prices. (His prediction that mass unemployment would be necessary to deflate sterling wages back to pre-war gold values had been proven right in the 1920s).
He also argued that to boost employment, real wages had to go down: nominal wages would have to fall more than prices. However, doing so would reduce consumer demand, so that the aggregate demand for goods would drop. This would in turn reduce business sales revenues and expected profits. Investment in new plants and equipment—perhaps already discouraged by previous excesses—would then become more risky, less likely. Instead of raising business expectations, wage cuts could make matters much worse.
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