6 papers
Demand Curvature and Pass-Through in Multiproduct Oligopoly
Paul S. Koh
Economic interventions change firms' pricing incentives, but their effects depend on how those incentives propagate across products and firms. This paper develops tractable charact…
Antitrust on Aisle Five: How Well Do Divestiture Remedies Work?
Xiao Dong, Paul Koh, Devesh Raval +2
Antitrust authorities frequently rely on structural divestitures to address competitive concerns raised by mergers. Using census-level establishment data and proprietary transactio…
Concentration-Based Inference for Evaluating Horizontal Mergers
Paul S. Koh
Antitrust authorities routinely rely on market concentration measures to assess the potential adverse effects of mergers on consumer welfare. Using a first-order approximation argu…
Market Definition: A Sensitivity Analysis
Paul S. Koh
Market definition holds significant importance in antitrust cases, yet achieving consensus on the correct approach remains elusive. As a result, analysts routinely entertain multip…
Merger Analysis with Unobserved Prices
Paul S. Koh
Standard empirical tools for merger analysis assume price data, which are often unavailable. I characterize sufficient conditions for identifying the unilateral effects of mergers…
Estimating Discrete Games of Complete Information: Bringing Logit Back in the Game
Paul S. Koh
Discrete games are central tools for empirical analysis of strategic interaction, but equilibrium multiplicity and partial identification often make them computationally difficult…