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Summary Previous business cycle models have made the assumption that all the variation in the labor input is either due to changes in hours per worker or changes in number of workers, but not both. In this paper, both vary. We think this is a better model for estimating the contribution of Solow technology shocks to aggregate fluctuations. We find that about 70% of the variance of U.S. postwar cyclical fluctuations is induced by variations in the Solow technology parameter.

Hours and employment variation in business cycle theory