Abstract
This paper empirically investigates whether changes in product market competition affect firm boundaries. Exploiting regulation-induced shocks to entry barriers and differences in regulation enforcement across cities to obtain exogenous variation in competition, we establish a negative causal effect of competition (through reduced entry barriers and a larger number of rival firms) on vertical integration in the setting of the Spanish local television industry between 1995 and 2002. Data and the online appendix are available at https://doi.org/10.1287/mnsc.2016.2633 . This paper was accepted by Bruno Cassiman, business strategy.
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