Abstract
Joan Robinson frequently argued that neoclassical general equilibrium theory could not determine the rate of interest in intertemporal models (see, for example, Robinson, 1973). There were two aspects to this critique: First, neoclassical marginal productivity theory depended on the notion of an aggregate capital stock. Because of aggregation problems, notably reswitching, this concept could not be defined without resorting to circular reasoning except in the most unrealistic of models. Second, for any rate of interest there is a different short-period equilibrium in a neoclassical model. There are not enough equilibrium conditions to determine what this rate of interest is.
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