A plucking model of business cycles

Abstract

In standard models, economic activity fluctuates symmetrically around a “natural rate” and stabilization policies can dampen these fluctuations but do not affect the average level of activity. An alternative view – labeled the “plucking model” by Milton Friedman – is that economic fluctuations are drops below the economy’s full potential ceiling. We show that the dynamics of the unemployment rate in the US display a striking asymmetry that strongly favors the plucking model: increases in unemployment are followed by decreases of similar amplitude, while the amplitude of a decrease does not predict the amplitude of the following increase. In addition, business cycles last seven years on average and unemployment rises much faster during recessions than it falls during expansions. We augment a standard labor search model with downward nominal wage rigidity and show how it can fit the plucking property.

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