1. Consumer Surplus in the Digital Economy: Estimating the Value of Increased Product Variety at Online Booksellers;E Brynjolfsson;Management Science,2003
2. The Simple Economics of Optimal Auctions;J Bulow;Journal of Political Economy,1989
3. Even though matching in the competing exchange in a model such as Gehrig's is random, the competing exchange is a thick market because there is a continuum of agents, and these agents participate only if they expect positive surplus from so doing. Hence, even if matching were random, such a thick competing exchange would eliminate the double coincidence of wants problem and would thus be severe competitive constraint for a thick market monopoly for niche products;J M Swinkels;Efficiency of Large Double Auctions,1993