Experimental comparisons of auctions under single- and multi-unit demand

An English clock auction and a sealed-bid auction with lowest accepted-bid pricing are studied in a controlled laboratory setting. Buyers bid for either a single unit or two units of the good. The sealed-bid auction generates more revenue than the English clock auction in both cases. The revenue from the English clock auction is lower in the two-unit demand environment than in the single-unit demand environment, due to strategic demand reduction on the part of bidders.