旧车市场模型中的逆向选择

阿克劳夫旧车市场模型在“信息经济学”中占有非常重要的地位．而在现实中，不同的买主对相同质量车的评价一般也是不同的，为了解决这个问题，考虑到随机因素对于车给买者所带来效用的影响，假定质量为车给买者带来的总效用，对旧车市场模型作了必要的补充，然后通过对改进模型进行数学上的分析，得出了均衡交易量取决于买者的评价参数和卖主的评价参数的共同作用这一结论，这个结果和实际情况是一致的．

The Adverse Selection of Lemons Model

Lemons Model made by Akerlof.G is very important in information economics.In reality,various buyers' remarks on cars of the same quality are different.Some random factors,which influence buyers' utilities for cars of the same quality,are considered for the problem solving.Assuming the general quality of a car,the paper makes necessary complement to the old car market model,then conducts a mathematical analysis by improving the model,draws a conclusion that the balanced trade amount is decided by evaluation parameter of buying and seller,which is consistent with reality.