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This paper develops a theory of Giffen behavior that resultsfrom a second rationing constraint. In contrast to standard analysis, this approach is virtually independent of the spec@ form of consumer preferences. The effect isfirst developed in a two-good world along with an example, then extended to a more general case to determine if the effect vanishes as the choice set is expanded. The results demonstrate that Giffen behavior is plausible when a second rationing constraint applies and, furthermore, adding additional goods to the choice set does not necessarily cause the effect to vanish.

The vast majority of market valuations employ either some formal estimator such as ordinary least squares (OLS) or rely upon an informal set of rules defining the grid adjustment estimator. The success of the grid adjustment estimator suggests the data do not obey the ideal assumptions underlying OLS. However, the grid adjustment estimator's lack of a formal statistical foundation makes it difficult to use for inference and other purposes. This article demonstrates how to generalize the grid estimator and OLS to potentially obtain the best features of both. Interestingly, the generalization defines a spatial autoregression. On an empirical example the spatial autoregression outperforms the grid estimator which in turn outperforms OLS. Copyright American Real Estate and Urban Economics Association.