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May larger merger synergies be bad news for consumers? Endogenous post-merger internal organization

Brito, D., M. Catal„o-Lopes (forthcoming), "May larger merger synergies be bad news for consumers? Endogenous post-merger internal organization", The Scandinavian Journal of Economics.
Abstract:

This paper endogenizes the post?merger internal organization of firms, considering two alternative structures: multidivisional, in which separate divisions are kept, and traditional, with cost synergies. We analyze when each structure occurs in equilibrium and how it affects welfare. We show that higher synergies do not necessarily lead to higher consumer surplus: firms may opt for a merger type that does not increase consumer surplus as much as the one that would occur with lower synergies. This highlights the importance of antitrust authorities basing their decisions not just on the magnitude of eventual synergies but also on the post?merger organizational form.