难道不应该都用偏导么？Walrasian Demand是多元函数啊？

2# twomantou 需求的价格弹性点弹性的公式不是啊。。。

3# cjsfight

From wiki and MWG:

On the graduate level, Mas-Colell, Winston, and Green (1995) defines elasticity of demand with respect to price as follows. Let be the demand of goods as a function of parameters price and wealth, and let be the demand for good . The elasticity of demand with respect to price pk is

楼主看的哪本书啊，我怎么没看见呢

5# danyuner