THE CENTER FOR THE STUDY OF INDUSTRIAL ORGANIZATION AT NORTHWESTERN UNIVERSITY Working Paper #0078 An Empirical Perspective on Auctions By Ken Hendricks University of Texas and Robert H. Porter* Northwestern University First Draft: April, 2006 This Draft: June, 2006 * Forthcoming in the Handbook of Industrial Organization (Vol. III), edited by M. Armstrong and R. Porter. We are grateful to Mark Armstrong, Phil Haile, Jakub Kastl, Paul Klemperer and Harry Paarsch for helpful comments. Visit the CSIO website at: www.csio.econ.northwestern.edu. E-mail us at:
[email protected]. Abstract We describe the economics literature on auction markets, with an emphasis on the connection between theory, empirical practice, and public policy, and a discussion of out- standing issues. We describe some basic concepts, to highlight some strengths and weaknesses of the literature, and so indicate where further research may be warranted. We discuss identification and estimation issues, with an emphasis on the connection between theory and empirical practice. We also discuss both structural and reduced form empirical approaches. Keywords: auctions, bidding, identification, estimation, collusion, bid rigging. Contents 1 Introduction 4 2 Model and Notation 8 3 Structural Analysis of Second-Price Auctions 12 3.1 Theory . 12 3.2 Estimation . 17 3.3 Identi…cation . 24 4 Structural Analysis of First Price Auctions 27 4.1 Theory . 28 4.2 Estimation . 30 4.3 Identi…cation . 36 5 Tests of Private Versus Common Values 38 6 Tests of the Theory 43 6.1 Pure Common Value Auctions . 44 6.1.1 The Asymmetric Case . 46 6.1.2 The Symmetric Case .