Search Costs and Investment in Quality
分析了搜索成本降低如何影响企业投资质量的激励，发现存在两种相反效应，净效果取决于初始质量分布，并解释了“超级明星效应”。
In this paper we analyze how lower search costs affect firms' incentives to invest in quality. We identify two conflicting effects. On the one hand, lower search costs increase incentives to invest in quality by eroding the market share of low quality firms and increasing the market share of high quality firms. On the other hand, by intensifying price competition, lower search costs adversely affect high quality firms more than low quality firms. The net effect of a change in the search cost on quality is shown to depend on the initial quality distribution. There is a critical value such that, if the proportion of high quality firms is initially below this value, lower search costs increase this proportion, whereas if the initial quality is above this value, lower search cost decreases the proportion of high quality firms. We show that our results are consistent with a ‘superstar effect.’