Ramsey Meets Laibson in the Neoclassical Growth Model

Robert Barro

The Quarterly Journal of Economics, 1999, vol. 114, issue 4, 1125-1152

Abstract: The neoclassical growth model is modified to include a variable rate of time preference. With no commitment ability and log utility, the equilibrium features a constant effective rate of time preference and is observationally equivalent to the standard model. The extended framework yields testable linkages between the extent of commitment ability and the rates of saving and growth. The model also has welfare implications, including the optimal design of institutions that facilitate household commitments. Steady-state results are obtained for general concave utility functions, and some properties of the transitional dynamics are characterized for isoelastic utility.

Date: 1999
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The Quarterly Journal of Economics is currently edited by Robert J. Barro, Lawrence F. Katz, Nathan Nunn, Andrei Shleifer and Stefanie Stantcheva

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