Johnson, Justin Pappas and Rhodes, Andrew (2021) Multiproduct mergers and quality competition. Rand Journal of Economics, vol.52 (n°3). pp. 633-661.

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Abstract

We investigate mergers in markets where quality differences between products are central and firms may reposition their product lines by adding or removing products of different qualities following a merger. Such mergers are materially different from those studied in the existing literature. Mergers without synergies may exhibit a product-mix effect which raises consumer surplus, but only when the pre-merger industry structure satisfies certain observable features. Post-merger synergies may lower consumer surplus. The level of, and changes in, the Herfindahl–Hirschman Index may give a misleading assessment of how a merger affects consumers. A merger may benefit some outsiders but harm others.

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