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Estimating Firm-Level Demand at a Price Comparison Site: Accounting for Shoppers and the Number of Competitors

Baye, Michael R., Gatti, Rupert J., Kattuman, Paul A. and Morgan, John John, "Estimating Firm-Level Demand at a Price Comparison Site: Accounting for Shoppers and the Number of Competitors" (December 2004). Available at SSRN:


    Clearinghouse models of online pricing - such as Varian (1980), Rosenthal (1980), Narasimhan (1988), and Baye-Morgan (2001) - view a price comparison site as an "information clearing-house" where shoppers and loyals obtain price and product information to make online purchases. These models predict that the responsiveness of a firm's demand to a change in its price depends on the number of sellers and whether the price change results in the firm charging the lowest price in the market. Using a unique firm-level dataset from Kelkoo.com (Yahoo!'s European price comparison site), we examine these predictions by providing estimates of the demand for PDAs. Our results indicate that the number of competing sellers and both the firm's location on the screen and relative ranking in the list of prices are important determinants of an online retailer's demand. We find that an online monopolist faces an elasticity of demand of about -2, while sellers competing against 10 other sellers face an elasticity of about -6. We also find empirical evidence of a discontinuous jump in a firm's demand as its price declines from the second-lowest to the lowest price. Our estimates suggest that about 13% of the consumers at Kelkoo are "shoppers" who purchase from the seller offering the lowest price.
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