收入因素与中国劣质品市场的部分逆向选择

基于Akerlof逆向选择模型,引入收入因素对其分析,通过说明收入因素影响消费偏好,进而改变消费者的无差异曲线,建立一个有限次交易后最终达到非零均衡的部分逆向选择的基本模型,并着重从这一侧面,即收入因素的影响,分析为什么在中国劣质品市场会长期存在。研究表明：购买偏好因收入增加而改变明显的劣质品的解决途径是增加人们的收入水平;购买偏好随收入增加改变不明显的劣质品的解决途径是增加外部干预。

Income Factors and Part Inverse Choice of China's Inferior Market

Based on the Akerlof inverse choice model,analyzing the income factors,we can see the income factors can affect the consume preference and then change the consumers' non-difference curve.We need to analyze the reason why the inferior market is existing for long time in China by setting up a part inverve choice model which can get the non-vanishing equilibrium after limited transactions.The research result shows that the inferior products' consume trend changed by the income increasing can be soluted through increasing people's income level,ones changed not-obviously can be soluted by increasing the exterior intervention.