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Intertemporal Substitution in Macroeconomics

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  • N. Gregory Mankiw
  • Julio J. Rotemberg
  • Lawrence H. Summers

Abstract

Modern neoclassical theories of the business cycle posit that aggregate fluctuations in consumption and employment are the consequence of dynamic optimizing behavior by economic agents who face no quantity constraint. In this paper, we estimate an explicit model :f this type. In particular, we assume that the observed fluctuations correspond to the decisions of an optimizing representative individual. This individual has a stable utility function which is additively separable over time but not necessarily additively separable in consumption and leisure. We estimate three first order conditions which represent three margins on which the individual is optimizing. He can trade off present consumption for future consumption, present leisure for future leisure and present consumption for present leisure. Our results show that the aggregate U.S. data are extremely reluctant to be characterized by a model of this type. Not only are the overidentifying restrictions statistically rejected but, in addition, the estimated utility function is often not concave. Even when it is concave the estimates imply that either consumption or leisure is an inferior good.

Suggested Citation

  • N. Gregory Mankiw & Julio J. Rotemberg & Lawrence H. Summers, 1982. "Intertemporal Substitution in Macroeconomics," NBER Working Papers 0898, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:0898
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    References listed on IDEAS

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    1. Rubinstein, Mark, 1974. "An aggregation theorem for securities markets," Journal of Financial Economics, Elsevier, vol. 1(3), pages 225-244, September.
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