Corporate Governance, Product Market Competition, and Equity Prices

46 Pages Posted: 2 Dec 2008

See all articles by Xavier Giroud

Xavier Giroud

Columbia Business School - Finance and Economics; National Bureau of Economic Research (NBER); Centre for Economic Policy Research (CEPR)

Holger M. Mueller

New York University (NYU) - Department of Finance; National Bureau of Economic Research (NBER); Centre for Economic Policy Research (CEPR); European Corporate Governance Institute (ECGI)

Multiple version iconThere are 4 versions of this paper

Date Written: September 2008

Abstract

This paper examines the hypothesis that firms in competitive industries should benefit relatively less from good governance, while firms in non-competitive industries - where lack of competitive pressure fails to enforce discipline on managers - should benefit relatively more. Whether we look at the effects of governance on long-horizon stock returns, firm value, or operating performance, we consistently find the same pattern: The effect is monotonic in the degree of competition, it is small and insignificant in competitive industries, and it is large and significant in non-competitive industries. By implication, the effect of governance (in non-competitive industries) reported in this paper is stronger than what has been previously reported in Gompers, Ishii, and Metrick (2003, GIM) and subsequent work, who document the average effect across all industries. For instance, GIM's hedge portfolio - provided it only includes firms in non-competitive industries - earns a monthly alpha of 1.47%, which is twice as large as the alpha reported in GIM. The alpha remains large and significant even if the sample period is extended until 2006. We also revisit the argument that investors in the 1990s anticipated the effect of governance, implying that the alpha earned by GIM's hedge portfolio is likely due to an omitted risk factor. We find that while investors were indeed not surprised on average, they underestimated the effect of governance in non-competitive industries, the very industries in which governance has a significant effect in the first place.

Keywords: Corporate Governance, G-index, Product Market Competition

JEL Classification: D4, G3

Suggested Citation

Giroud, Xavier and Mueller, Holger M., Corporate Governance, Product Market Competition, and Equity Prices (September 2008). CEPR Discussion Paper No. DP6974. Available at SSRN: https://ssrn.com/abstract=1308045

Xavier Giroud

Columbia Business School - Finance and Economics ( email )

3022 Broadway
New York, NY 10027
United States

HOME PAGE: http://www.columbia.edu/~xg2285/

National Bureau of Economic Research (NBER) ( email )

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

Centre for Economic Policy Research (CEPR) ( email )

London
United Kingdom

Holger M. Mueller (Contact Author)

New York University (NYU) - Department of Finance ( email )

44 West 4th Street
New York, NY 10012-1126
United States
212-998-0341 (Phone)
212-995-4233 (Fax)

HOME PAGE: http://www.stern.nyu.edu/~hmueller/

National Bureau of Economic Research (NBER) ( email )

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

Centre for Economic Policy Research (CEPR)

London
United Kingdom

European Corporate Governance Institute (ECGI) ( email )

c/o ECARES ULB CP 114
B-1050 Brussels
Belgium

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