This paper aims to investigate the relationship between co-authorship network and academic productivity. We use two models to estimate the spillover effect on productivity from academic collaboration. A spatial autoregressive model gives us a depiction of it but suffers from the potential network endogeneity problem. A structural model is then used to model both network interaction and network formation processes, correcting the endogeneity bias on the estimated coefficients, and making possible a counterfactual analysis. The counterfactual simulation result suggests that the spillover effect has a substantial impact on both forming network links and raising output level.
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