Building on the work of Afriat and Varian, a nonparametric analysis of
consumption behavior is presented. Inner-bound and outer-bound repres
entations of preferences are obtained that are consistent with both th
e data and consumer theory. It is shown how a priori information on de
mand response can be incorporated in the analysis. The approach genera
tes estimates of price and income elasticities of demand. An applicati
on to U.S. consumption data illustrates the usefulness of the method f
or predicting demand behavior as well as for welfare analysis.