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Non-Market Interactions

  • Edward L. Glaeser
  • Jose Scheinkman

A large body of recent research argues that social, or non-market, interactions can explain a wide range of puzzling phenomena from fashion cycles to stock market crashes. This paper attempts to connect the range of these papers with a general model and a broad empirical overview. We establish conditions for existence and uniqueness of equilibria in social interactions models. The existence of multiple equilibria requires sufficient non-linearity in social interactions and only moderate heterogeneity across agents strategic complementarities are neither necesssary nor sufficient for multiple equilibria. We establish conditions for the existence of a social multiplier, which is the ratio of the aggregate outcome-input relationship to the individual outcome-input relationship. Models with multiple equilibria are empirically indistinguishable from models with significant social multipliers. Finally, we show the formal relationship between three known methods of empirically estimating social interactions, and suggests the plusses and minuses of these three approaches.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 8053.

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Date of creation: Dec 2000
Date of revision:
Publication status: published as Glaeser, Edward and Jose Scheinkman. “The Future of Urban Economics: Non-Market Interactions,” Brookings-Wharton Papers on Urban Affairs 1 (2000): 101-150.
Handle: RePEc:nbr:nberwo:8053
Note: EFG
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