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Why Did the Incumbency Advantage in U.S. House Elections Grow?

Cox, Gary W. and Katz, Jonathan N. (1996) Why Did the Incumbency Advantage in U.S. House Elections Grow? American Journal of Political Science, 40 (2). pp. 478-497. ISSN 0092-5853. doi:10.2307/2111633.

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Theory: A simple rational entry argument suggests that the value of incumbency consists not just of a direct effect, reflecting the value of resources (such as staff) attached to legislative office, but also of an indirect effect, reflecting the fact that stronger challengers are less likely to contest incumbent-held seats. The indirect effect is the product of a scare-off effect-the ability of incumbents to scare off high-quality challengers-and a quality effect-reflecting how much electoral advantage a party accrues when it has an experienced rather than an inexperienced candidate. Hypothesis: The growth of the overall incumbency advantage was driven principally by increases in the quality effect. Methods: We use a simple two-equation model, estimated by ordinary least-squares regression, to analyze U.S. House election data from 1948 to 1990. Results: Most of the increase in the incumbency advantage, at least down to 1980, came through increases in the quality effect (i.e., the advantage to the incumbent party of having a low-quality challenger). This suggests that the task for those wishing to explain the growth in the vote-denominated incumbency advantage is to explain why the quality effect grew. It also suggests that resource-based explanations of the growth in the incumbency advantage cannot provide a full explanation.

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Katz, Jonathan N.0000-0002-5287-3503
Additional Information:© 1996 by the Board of Regents of the University of Wisconsin System. Prepared for delivery at the American Political Science Association meetings, New York, September 1-3, 1994. Katz's work was supported by a National Science Foundation Graduate Fellowship. We thank Gary Jacobson for providing the data with which our estimations were run. We also thank participants in seminars at Yale and Stanford, and Mo Fiorina and Gary King, for helpful comments.
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Official Citation:Why Did the Incumbency Advantage in U.S. House Elections Grow? Gary W. Cox and Jonathan N. Katz American Journal of Political Science , Vol. 40, No. 2 (May, 1996) , pp. 478-497 Published by: Midwest Political Science Association Article DOI: 10.2307/2111633 Article Stable URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44326
Deposited By: Jonathan Katz
Deposited On:17 Mar 2014 20:57
Last Modified:10 Nov 2021 16:50

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