Is There "Curvature" in the Slutsky Matrix?
探讨贫困家庭与富裕家庭在相对价格变化时，补偿收入效应后替代行为的灵活性差异，并质疑是否需在斯卢茨基替代矩阵中增加第三维度来识别家庭收入。
D O the poor substitute among commodities more flexibly than the rich when relative prices change, even when compensated for the income effects of the price changes? Is it necessary to add a third dimension to the Slutsky substitution matrix to identify household income? In short, do the terms of the Slutsky elasticity matrix curve smoothly from poor households to rich households in such a way that equation (1) is meaningful?