On Interpreting Inverse Demand Systems: A Primal Comparison of Scale Flexibilities and Income Elasticities
比较逆需求系统中的规模弹性与直接需求系统中的收入弹性，指出两者仅在偏好同质或替代弹性为1时才紧密相关，并解释边际替代率随消费规模和比例的变化。
Abstract 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 between scale flexibilities and income elasticities is tight only if preferences are homothetic, a situation where neither measure is interesting, or if all elasticities of substitution are unitary. We make clear the relationship between the two measures in a coordinate system focusing on how marginal rates of substitution change with consumption scale and proportion.