对于既定的产量实现成本最小化(Cost Minimization) 。 subject to * 给定产量使成本最小化 x1 x2 如何在给定成本开支的情况下使产量最大? * 等成本曲线 A curve that contains all of the input bundles that cost the same amount is an iso-cost curve. ., given w1 and w2, the $100 iso-cost line has the equation * Iso-cost Lines Generally, given w1 and w2, the equation of the $c iso-cost line is Slope is * Iso-cost Lines c’ = w1x1+w2x2 c” = w1x1+w2x2 c’ < c” x1 x2 Slope is * 成本最小化 x1 x2 等产量线上的每一点(投入束)均能生产出y单位的产出,哪一点最便宜? f(x1,x2) = y * The Cost-Minimization Problem x1 x2 f(x1,x2) = y x1* x2* f(x1,x2) = y 等成本线的斜率 = 等产量线的斜率 与利润最大化问题的区别何在? 最优分配原理 * 有条件的要素需求 subject to * 举例 某厂商的 Cobb-Douglas 生产函数为 要素价格分别为 w1 和 w2. 求该厂商的有条件的投入需求函数( conditional input demand functions).