Exchange-Rate Dynamics and Optimal Asset Accumulation Revisited

10 Pages Posted: 8 Jan 2007 Last revised: 4 Apr 2015

See all articles by Maurice Obstfeld

Maurice Obstfeld

University of California, Berkeley; Peterson Institute for International Economics; National Bureau of Economic Research; Centre for Economic Policy Research

Date Written: February 1988


It has recently been observed that when equations of motion for state variables are nonautonomous, optimal control problems involving Uzawa's endogenous rate of time preference cannot be solved using the change-of-variables method common in the literature. Instead, the problem must be solved by explicitly adding an additional state variable that measures the motion of time preference over time. This note reassesses earlier work of my own on exchange rate dynamics, which was based on a change-of- variables solution procedure. When the correct two-state-variable solution procedure is used, the model's qualitative predictions are unchanged. In addition, the analysis yields an intuitive interpretation of the extra co-state variable that arises in solving the individual's maximization problem.

Suggested Citation

Obstfeld, Maurice, Exchange-Rate Dynamics and Optimal Asset Accumulation Revisited (February 1988). NBER Working Paper No. t0064. Available at SSRN:

Maurice Obstfeld (Contact Author)

University of California, Berkeley ( email )

530 Evans Hall #3880
Berkeley, CA 94720
United States


Peterson Institute for International Economics ( email )

1750 Massachusetts Avenue, NW
Washington, DC 20036
United States

National Bureau of Economic Research ( email )

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

Centre for Economic Policy Research ( email )

United Kingdom

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