Full text currently not available on the LRA. The published version is available from the publisher's website at: http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1468-0297 ; DOI: 10.1111/j.1468-0297.2011.02425.xThis article studies the impact of competition on the degree of inefficiency in lemons markets. More precisely, we characterise the second-best mechanism (i.e. the optimal mechanism with private information) in a stylised lemons market with finite numbers of buyers and sellers. We then study the relationship between the degree of efficiency of the second-best mechanism and market competitiveness. A general message of our results is that increasing competition may not help lemons markets in some circumstances. Moreover, increasing competition beyond a certain degree increases the distance between the first-best and second-best levels of efficiency
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