Internal Labor Markets, Wage Convergence, and Investment

60 Pages Posted: 25 May 2013 Last revised: 7 Jun 2019

See all articles by Rui Silva

Rui Silva

London Business School - Department of Finance

Date Written: June 5, 2019


The literature on conglomerates has focused on the allocation of investments across divisions. I study frictions in the internal labor market as a determinant of allocation of investments. Using detailed plant-level data, I document wage convergence in conglomerates: workers in low-wage industries collect higher-than-industry wages when the diversified firm is also present in high-wage industries. Exploiting a quasi-experiment involving the implementation of the NAFTA agreement that exogenously increases worker wages of exporting plants, I track the evolution of wages in non-exporting plants in diversified firms that also own exporting plants, and find a significant increase in wages of these plants relative to unaffiliated non-exporting plants after the event. I confirm this effect by studying exogenous shocks to worker wages that result from changes in minimum wage laws at state level, and analyze the transmission towards workers of the firm in other states. This pattern of wage convergence affects investments. Plants in which workers collect higher-than-industry wages respond by increasing automation in production.

Suggested Citation

Silva, Rui, Internal Labor Markets, Wage Convergence, and Investment (June 5, 2019). US Census Bureau Center for Economic Studies Paper No. CES-WP-13-26. Available at SSRN: or

Rui Silva (Contact Author)

London Business School - Department of Finance ( email )

Sussex Place
Regent's Park
London NW1 4SA
United Kingdom

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