summersalase 发表于 2009-9-8 02:14
书上说如果竞争均衡时的价格为(P1,P2),那么对于所有价格乘以任意常数t,由于预算线没有变动,因此竞争性均衡 点 也没有变。那么我觉得判断题2应该是对的。如果是这样的话价格体系应该也不唯一吧?
选择题我觉得应该选C。一个消费者的供给应该等于另一个消费者的需求,因此我觉得消费比率是相同的
I am completely with you for the TRUE/FALSE questions. For the first one, uniqueness of competitive equilibrium cannot be guaranteed with minimum requirements. For the second one, I cannot see why something other than relative price matters.
For the multiple selection question, I would choose A. C implies that the Pareto optimal curve is a straight line(diagonal), which requires homothetic preferences that are way beyond "well-behaved". Please refer to the discussion a week ago on Edgeworth box where I gave the conditions that lead to diagonal Pareto curves:
http://www.pinggu.org/bbs/viewthread.php?tid=537075&
Interior points on Pareto curves share the defining characteristics of tangency condition which implies equaled MRS. This is the reason why A is correct.
Sorry for answering this in English. I am in the lab where no Chinese input was installed.