Personne : Boucher, Vincent
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Boucher
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Vincent
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Université Laval. Département d'économique
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ncf10251505
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Publication Accès libre My friend far far away : a random field approach to exponential random graph models(Blackwell Publishers, 2017-06-22) Boucher, Vincent; Mourifié, IsmaelWe explore the asymptotic properties of strategic models of network formation in very large populations. Specifically, we focus on (undirected) exponential random graph models. We want to recover a set of parameters from the individuals' utility functions using the observation of a single, but large, social network. We show that, under some conditions, a simple logit‐based estimator is coherent, consistent and asymptotically normally distributed under a weak version of homophily. The approach is compelling as the computing time is minimal and the estimator can be easily implemented using pre‐programmed estimators available in most statistical packages. We provide an application of our method using the Add Health database.Publication Accès libre Conformism and self-selection in social networks(Elsevier Science, 2016-03-07) Boucher, VincentI present a model of conformism in social networks that incorporates both peer effects and self-selection. I show that conformism has positive social value and that social welfare can be bounded by network polarization and connectivity measures. I apply the model to empirical data on high school students’ participation in extracurricular activities. I find that the local effect of conformism (i.e. the endogenous peer effect for a fixed network structure) ranges from 7.5% to 45%, depending on the number of peers that an individual has. Simulations show that the optimal policies of an inequality-averse policymaker change depending on a school’s enrollment. Small schools should encourage shy students to interact more with other students, while large schools should focus on promoting role models within the school.