Revealed preference theory assumes that each consumer has demands that are rational, meaning that they arise from the maximization of his or her own utility function. In contrast, econometric or statistical demand models assume that each consumer's demands equal a rational systematic component...

This paper provides general conditions for aggregating commodities without separable utility. These conditions impose weaker and more empirically plausible restrictions on price movements than the currently existing alternative to separability, the Hicks-Leontief composite commodity theorem. The...

This paper shows that there exists a relatively simple demand model that is consistent with utility maximization, and has nested within it both the almost ideal demand system and translog models. This model is exactly aggregated, then estimated using aggregate U.S. demand data. The results are...