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A Roy Model of Social Interactions

Author Info

  • Steve Cicala
  • Roland G. Fryer, Jr.
  • Jörg L. Spenkuch

Abstract

We develop a Roy model of social interactions in which individuals sort into peer groups based on comparative advantage. Two key results emerge: First, when comparative advantage is the guiding principle of peer group organization, the effect of moving a student into an environment with higher-achieving peers depends on where in the ability distribution she falls and the effective wages that clear the social market. In this sense our model may rationalize the widely varying estimates of peer effects found in the literature without casting group behavior as an externality in agents' objective functions. Second, since a student's comparative advantage is typically unobserved, the theory implies that important determinants of individual choice operate through the error term and may, even under random assignment, be correlated with the regressor of interest. As a result, linear in means estimates of peer effects are not identified. We show that the model's testable prediction in the presence of this confounding issue-an individual's ordinal rank predicts her behavior, ceteris paribus-is borne out in two data sets.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 16880.

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Date of creation: Mar 2011
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Handle: RePEc:nbr:nberwo:16880
Note: CH ED LS
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  • I0 - Health, Education, and Welfare - - General
  • J01 - Labor and Demographic Economics - - General - - - Labor Economics: General
  • J15 - Labor and Demographic Economics - - Demographic Economics - - - Economics of Minorities, Races, Indigenous Peoples, and Immigrants; Non-labor Discrimination

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Cited by:

  1. Wagner, Alexander F, 2011. "Relational contracts when the agent's productivity inside the relationship is correlated with outside opportunities," CEPR Discussion Papers 8378, C.E.P.R. Discussion Papers.
  2. Will Dobbie & Roland G. Fryer, Jr., 2011. "Exam High Schools and Academic Achievement: Evidence from New York City," NBER Working Papers 17286, National Bureau of Economic Research, Inc.

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