1. MC=MR, (note: MC includes the marginal cost of producing goods and tax, Price in MR is now a function of output under monopoly)

2. You can do that as long as given another parameter, for instance, Income. With constrained first order condition

Max U=xy+x s.t. Px*X+Py*Y=I, rewrite it in Langrangian, differertiate with respect to x and y. you can get demand function for Y.

[此贴子已经被作者于2006-4-7 22:21:30编辑过]

第二个题目的答案是：Y＝M₀/(2P_Y+1)，其中M₀是总支出。