Supply and demand explanations and theirceteris paribusclauses

Abstract

This paper argues that supply and demand explantions are causal explanations and that it is helpful to recognize this fact explicity, for then one can appreciate that the variables impounded in the ceteris paribusclauses attached to supply and demand curves are other causes. One can then specify clearly the conditions of membership in a ceteris pairbusclause: 1) include all those factors that within the given time period significantly affect the amount supplied or demanded but; 2) do not include any factors that themselves within the given time period significantly depend on the price of the particular commodity or service. Note the vague word ‘significantly’. If one insists on the general interdependencies established in general equilibrium analyses, one must reject partial equilibrium analyses altogether, but to do so would rule out work that may be enlightening and useful. Such theoretical purism is also indefensible, since general equilibrium analyse rely on similar causal approximations. This analyses of ceteris paribusclauses is helpful in understanding where supply and demand analysis or comparative statics goes wrong, as in traditional functional distribution theory.

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