Costless discrimination and unequal achievements in an experimental tournament

We investigate the emergence of discrimination in an experiment where individuals affiliated to different groups compete for a monetary prize, submitting independent bids to an auctioneer. The auctioneer receives perfect information about the bids (i.e. there is no statistical discrimination), and she has no monetary incentive to favour the members of her own group (the bidders are symmetric). We observe nonetheless some discrimination by auctioneers, who tend to assign the prize more frequently to a member of their own group when two or more players put forward the highest bid. Out-group bidders react to this bias and reduce significantly their bids, causing an average decay of their earnings throughout thegame, with cumulative effects that generate strongly unequal outcomes. Because the initialbias is costless, such mechanism can survive even in competitive market, providing arationale for a well-known puzzle in the literature, i.e. the long-run persistence of discrimination.