3. Demand function One production, regular p as 1. let x(w) be the profit maximization choice(function means x is single point under w) of input factor vector under factor price w. then must hold 成 =0→Vf(x)=w 的条件是one production 82)∠0→1J(x) Is symmetric negative definite lecture 2 for Chu Kechen Honors Collegelecture 2 for Chu Kechen Honors College 3.Demand function • One production: regular p as 1. let x(,w) be the profit maximization choice (function means x is single point under w) of input factor vector under factor price w. then must hold: (.) 0 ( ) (, ) f  = →  =  x w x w 2 2 (.) 0 ( ) is symmetric negative definite. D f    →  2 x x 注意：这两条式子成立 的条件是one production