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[The authors] exploit presumably exogenous variation in the availability of college-educated workers at the province level produced by a reform that increased the supply of higher education to estimate human capital production externalities for Italian manufacturing firms. [The authors] show that when the potential endogeneity of local human capital is addressed, the elasticity of white-collar workers' wages with respect to the local college share is around 0.1, while [the authors] find no evidence of a positive effect of local human capital on blue-collar workers' wages.

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