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Richard Engelbrecht-Wiggans, John A List, David H Reiley

Cited by*: 1 Downloads*: 4

My coauthors and I reply to the comments of Daniel Levin on our paper "Demand Reduction in Multiunit Auctions: Evidence from a Sportscard Field Experiment." In his comment, Levin presents new theory and proposes a new equilibrium to explain annomalies reported in our earlier sportscard auction, such as higher first-unit bids under the uniform-price institution. We evaluate his theory and equilibrium in the context of both uniform-price and Vickrey auctions and point out our concerns. Where possible, we attempt to test the predictions of his theory with our existing data.

Richard Engelbrecht-Wiggans, John A List, David H Reiley

Cited by*: 10 Downloads*: 9

Auction theory has recently revealed that multi-unit uniform-price auctions, such as those used by the U.S. Treasury for debt sales, entail demand-reduction incentives that can cause inefficient allocations. Recent experimental results show that bidders do indeed strategically reduce their bids in uniform-price auctions. The present paper extends this work, both theoretically and experimentally, to consider the effects of varying numbers of bidders. We derive several theoretical predictions, including the result that demand reduction should decrease with increasing numbers of bidders, though some demand reduction remains even in the asymptotic limit. We then examine the bidding behavior of subjects in this environment by auctioning dozens of Cal Ripken, Jr. baseball cards using both uniform-price and Vickrey auction formats. The field data are broadly consistent with the theoretical predictions of our model: most notably, demand reduction on second-unit bids becomes much smaller and harder to detect as the number of bidders increases.

Richard Engelbrecht-Wiggans, John A List, David H Reiley

Cited by*: 10 Downloads*: 3

Recent auction theory and experimental results document strategic demand reduction by bidders in uniform-price auctions. The present article extends this area of research to consider the effects of varying the number of bidders. Our theoretical model predicts that demand reduction should decrease with an increase in the number of bidders. Considerable demand reduction remains even in the asymptotic limit, although truthful bidding yields profits very close to those of equilibrium play. We experimentally confirm several of our predictions by examining bidding behavior of subjects in an actual marketplace, auctioning dozens of sportscards using both uniform-price and Vickrey auction formats.