Law and Economics Commons^™

Were The 1982 Merger Guidelines Old News?, Alan J. Meese, Sarah L. Stafford

Faculty Publications

This paper examines the impact of the 1982 Department of Justice Merger Guidelines on the stock market prices of publicly traded firms in the United States. We argue that those Guidelines were perceived by the market as a real change in enforcement policy that would result in substantial deregulation of mergers throughout the economy. We conduct an event study of S&P 500 firms to test this hypothesis and find evidence of a significant positive effect on the stock prices of firms in moderately concentrated industries subject to antitrust regulation, the firms for which the 1982 Guidelines articulate a substantially less …