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Do retail mergers affect competition? Evidence from grocery retailing

机译:零售兼并会影响竞争吗?杂货零售的证据

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摘要

This study estimates the price effects of horizontal mergers in the U.S. grocery retailing industry. We examine fourteen regions affected by mergers, including mergers in highly concentrated and relatively unconcentrated markets. We identify price effects by comparing markets affected by mergers to unaffected markets using difference-in-difference estimation with three different comparison groups, propensity score weights, and by using the synthetic control method. Our results are robust to the choice of control group and estimation technique. We find that mergers in highly concentrated markets are most frequently associated with price increases, and mergers in less concentrated markets are most often associated with price decreases.
机译:这项研究估计了美国杂货零售业中横向合并的价格效应。我们研究了十四个受合并影响的地区,包括高度集中和相对不集中的市场中的合并。我们通过使用三个不同的比较组,倾向得分权重以及采用综合控制方法的差异差异比较,来比较受合并影响的市场和未受影响的市场,从而确定价格效应。我们的结果对于控制组和估计技术的选择是可靠的。我们发现,高度集中市场中的合并最常与价格上涨相关,而不太集中市场中的合并最常与价格下跌相关。

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