NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Socially Optimal Districting: An Empirical Investigation

Stephen Coate, Brian Knight

NBER Working Paper No. 12313
Issued in June 2006
NBER Program(s):   PE   POL

This paper provides an empirical exploration of the potential gains from socially optimal districting. As emphasized in the political science literature, districting matters because it determines the seat-vote curve, which relates the fraction of seats parties obtain to their share of the aggregate vote. Building on the theoretical work of Coate and Knight (2006), which develops and analyzes the optimal seat-vote curve, this paper develops a methodology for computing actual and optimal seat-vote curves and for measuring the potential welfare gains that would emerge from implementing optimal seat-vote curves. This method is then applied to analyze districting plans in place during the 1990s to elect U.S. State legislators. The analysis shows that the plans used by the states in our data set generate seat-vote curves that are overly responsive to changes in voters' preferences. While there is significant variation across states, the potential welfare gains from implementing optimal seat-vote curves are on average small relative to the overall surplus generated by legislatures. This appears to be because seat-vote curves are reasonably close to optimal rather than because aggregate welfare is insensitive to varying districting plans. Interestingly, implementing proportional representation would produce welfare levels quite close to those achieved by implementing optimal seat-vote curves.

download in pdf format
   (376 K)

email paper

This paper is available as PDF (376 K) or via email.

Machine-readable bibliographic record - MARC, RIS, BibTeX

Document Object Identifier (DOI): 10.3386/w12313

Published: Stephen Coate & Brian Knight, 2007. "Socially Optimal Districting: A Theoretical and Empirical Exploration," The Quarterly Journal of Economics, MIT Press, vol. 122(4), pages 1409-1471, November.

Users who downloaded this paper also downloaded these:
Coate and Knight w11462 Socially Optimal Districting
 
Publications
Activities
Meetings
NBER Videos
Data
People
About

Support
National Bureau of Economic Research, 1050 Massachusetts Ave., Cambridge, MA 02138; 617-868-3900; email: info@nber.org

Contact Us