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1 Highlights  We study the impact of horizontal mergers on firms' critical discount factors  The simulation setting is based on a random coefficient model of demand  Results show that mergers strengthen the incentives to collude of the merged firm  Results show that mergers weaken the incentives to collude of non-merging parties  We propose screening tools able to approximate the magnitude of coordinated effects Abstract This paper aims at evaluating the coordinated effects of horizontal mergers by simulating their impact on firms' critical discount factors. We consider a random coefficient model on the demand side and heterogeneous price-setting firms on the supply side. Results suggest that mergers strengthen the incentives to collude among merging parties, but weaken the incentives of non-merging parties, with the former effect being stronger. To assess the magnitudes of these effects, we introduce the concepts of Asymmetry in Payoffs and Change in Payoffs effects, which allow us to identify appropriate screening tools according to the relative pre-merger payoffs of merging parties. a Corresponding author. Manufacture des Tabacs (Office MF 415) -21 Allée de Brienne,

This article assesses the effectiveness of outlet divestitures as remedies in a merger between two large gasoline retailers. Results show that divestitures are effective in disciplining the increase in margins generated by the merger, but only for competing gas stations located within a one kilometer radius and only in municipalities with a low density of stations impacted by the merger. Interestingly, this density indicator is a good predictor of both the anticompetitive effect of the merger and the effectiveness of divestitures. Finally, prices of one merging party decreased in locations unaffected by higher concen tration, evidencing the presence of efficiency gains.

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In developing countries, the penetration of Liquefied Petroleum Gas (LPG) is still high, and hence the entry of Natural Gas (NG) networks coexists with the use of LPG by an important fraction of households. Thus, a relevant policy question is whether the number and degree of horizontal integration among NG and LPG providers has an influence on the level of retail prices. Using selfreported LPG retail prices of the largest LPG provider in Chile for the period 2013-2014, we estimate that the presence of a competing NG network generates an average decrease of LPG retail prices within the range [-2,-4%] depending on the econometric specification. Thus, since the presence of an additional competing provider (i.e., an NG retailer) has an influence on the level of prices, LPG and NG may be indeed considered as imperfect substitutes. The main policy implication of this result is that the degree of horizontal integration between both types of providers should matter and there would be room for regulatory intervention aimed at proposing remedies in order to mitigate any potential anticompetitive effect