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- W1481614329 abstract "Merger retrospectives often use a difference in differences (DID) approach to measure the price effects of mergers. As used in these studies, this approach implicitly assumes that the price in the control market fully controls for supply and demand shocks in the treatment market if the two markets experience the same demand and supply shocks. In this paper, we first show that this is only true if the parameters that determine how supply and demand shocks affect price are the same in the two markets. We then show that in many plausible circumstances the DID approach could either overestimate or underestimate the price effects of a merger." @default.
- W1481614329 created "2016-06-24" @default.
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- W1481614329 date "2007-01-01" @default.
- W1481614329 modified "2023-09-23" @default.
- W1481614329 title "Difference in Differences Analysis in Antitrust: What Does it Really Measure?" @default.
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- W1481614329 doi "https://doi.org/10.2139/ssrn.984540" @default.
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