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This chapter illustrates that the shape of the term structure of discount rates is determined by the way the wealth effect and the precautionary effects evolve with the time horizon. When the growth rate of consumption is constant, then consumption increases exponentially, and the intertemporal rate of substitution, which is the discount factor, decreases exponentially. This requires that the discount rate is constant. The simplest extension of this to uncertainty is to assume that the growth rate of the economy follows a random walk. In that case, the variance of *log* consumption increases linearly, which yields an exponentially increasing precautionary effect for the discount factor. This justifies a constant precautionary effect on the discount rate, yielding a crucial result for the theory of efficient discount rates.

*Keywords: *
term structure;
random walk;
mean-reversion;
consumption;
substitution;
precautionary effect;
efficient discount rates

*Chapter.*
*4880 words.*
*Illustrated.*

*Subjects: *
Economic Development and Growth

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