We analyze demand substitution relationships among fish in the snapper/grouper complex in the southeast United States. Monthly data from 1977 to1992 are used to form a set of six fish aggregates. The dockside demands are analyzed in an empirical inverse demand system, developed for the purposes...

Demand analysis requires aggregation of commodities. Some are imposed at the data collection level, leaving some for the estimation level. When data are collected, the implicit assumption underlying the aggregation is perfect substitutability: one gallon of gasoline is viewed by consumers as...

Scale flexibilities in inverse demand systems describe how marginal valuations change with expansions in the consumption bundle. Such effects clearly are related to income elasticities in direct demand systems. However, the connection is not so close as it first appears. We argue that the link...