This paper examines demand systems where the demand for a good depends on other prices only through a common price aggregator (a scalar function of all prices). We refer to this property as ``generalized separability'' and provide the functional forms of demand that this property implies when...

This paper examines demand systems where the demand for a good depends only on its own price, consumer income, and a single aggregator synthesizing information on all other prices. This generalizes directly-separable preferences where the Lagrange multiplier provides such an aggregator. As...

Measuring changes in welfare, and particularly the price index, is challenging in the absence of well-measured prices covering the entire consumption basket. We propose and implement a new approach to estimate changes in income-group specific price indices and welfare using rich, but widely...