typical merger. Most mergers we study are highly asymmetric (a large firm acquires a much smaller firm) and rarely challenged …

We study the effect of a merger between two Dutch supermarket chains to assess its effect on the depth as well as … composition of assortment. We adopt a difference-in-differences strategy that exploits local variation in the merger's effects …, controlling for selection on observables through a matching procedure when defining our control group. We show that the merger led …

Revisions incorporated into the Horizontal Merger Guidelines in 2010 claim that the Department of Justice and the …