TY  - JOUR
AU  - Brock,William A.
AU  - Durlauf,Steven N.
TI  - Discrete Choice with Social Interactions I: Theory
JF  - National Bureau of Economic Research Working Paper Series
VL  - No. 5291
PY  - 1995
Y2  - October 1995
UR  - http://www.nber.org/papers/w5291
L1  - http://www.nber.org/papers/w5291.pdf
N1  - Author contact info:
William Brock
Department of Economics
University of Wisconsin
1180 Observatory Drive
Madison, WI   537061393
E-Mail: wbrock@ssc.wisc.edu

Steven N. Durlauf
Department of Economics
University of Wisconsin
1180 Observatory Drive
Madison, WI  53706-1393
Tel: 608/263-3859
Fax: 608/262-2033
E-Mail: sdurlauf@ssc.wisc.edu
AB  - This paper provides an analysis of aggregate behavioral outcomes when individual utility exhibits social interaction effects.  We study generalized logistic models of individual choice which incorporate terms reflecting the desire of individuals to conform to the behavior of others in an environment of noncooperative decisionmaking.  Laws of large numbers are generated in such environments.  Multiplicity of equilibria in these models, which are equivalent to the existence of multiple self-consistent means for average choice behavior, will exist when the social interactions exceed a particular threshold.  Local stability of these multiple equilibria is also studied.  The properties of the noncooperative economy are contrasted with the properties of an economy in which a social planner determines the set of individual choices.  The model is additionally shown to be well suited to explaining a number of empirical phenomena, such as threshold effects in individual behavior, ethnic group fixed effects of income equations, and large cross-group differences in binary choice behavior.
ER  -