"How Geographic Concentration Affects Industrial Influence: Evidence 
From U.S. Data"

Ronald Rogowski
rowgowski@polisci.ucla.edu

Mark Kayser
makayser@ucla.edu

Daniel Kotin
kotin@nicco.sscnet.ucla.edu

Department of Political Science
UCLA
Los Angeles, CA 90095-1472

Abstract:

We develop a new measure of the political influence of various U.S. 
economic sectors based on deviations from world prices.  Comparing 
this measure with these sectors' regional concentrations (a Gini 
index of Congressional districts) reveals an inverted-U 
relationship: maximal influence appears to be exerted by moderately 
concentrated sectors (Gini=~ .62); as concentration goes higher or 
lower, influence declines.