This paper presents an empirical investigation of adverse selection in
the wholesale used car market. New car dealers (who sell both new and
used cars) differ from used car dealers (who sell only used cars) in
the propensity to sell trade-ins on the wholesale market. Models of ad
verse selection suggest that the dealer type that sells a higher propo
rtion of its trade-ins on the wholesale market will sell, on average,
cars of higher quality and receive in return a higher price. A survey
of dealers' wholesale behavior and prices collected at a wholesale auc
tion are used to test this prediction. I find weak evidence for advers
e selection.