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Our paper utilizes semi-nonparametric and nonparametric methods to directly estimate consumer surplus in eBay computer monitor sales. We compare these with parametric estimates. We also develop a new measure of how competitive an auction is–the consumer share of surplus–and a new method to calculate these statistics. This distribution free methodology requires the assumption that the pool of potential bidders is constant across auctions, but it is not sensitive to the upper tail and does not require estimating the underlying distribution of values. [ABSTRACT FROM AUTHOR]