This article surveys recent empirical evidence on efficiencies and competitive harm that are associated with vertical mergers. It discusses both ex post or retrospective empirical studies that rely on post–merger data and ex ante or forecasting techniques that use premerger data. It develops the idea that although there is a need for vertical merger screening tools there are a number of problems that are associated with attempts to adapt horizontal screens to the vertical context. Mergers in the technology, media, and telecom sectors are emphasized because they tend to dominate contested vertical mergers.

中文翻译：

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纵向合并：事后证据和事前评估方法的调查

本文调查了与垂直合并相关的效率和竞争损害的最新经验证据。它讨论了依赖合并后数据的事后或回顾性实证研究，以及使用合并前数据的事前​​或预测技术。它提出了这样一个想法，即尽管需要垂直合并筛选工具，但仍有许多问题与尝试使水平筛选适应垂直上下文有关。强调了技术，媒体和电信行业的合并，因为它们往往在有争议的垂直合并中占主导地位。