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QUANTIFYING THE SCOPE FOR EFFICIENCY DEFENSE IN MERGER CONTROL: THE WERDEN‐FROEB‐INDEX* |
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| Authors: | MARIE GOPPELSROEDER MAARTEN PIETER SCHINKEL JAN TUINSTRA |
| Affiliation: | 1. ACLE, University of Amsterdam, Roetersstraat 11, 1018 WB Amsterdam, The Netherlands. e‐mail:m.goppelsroeder@uva.nl.;2. Department of Economics and ACLE, University of Amsterdam and CEPR, Roetersstraat 11, 1018 WB Amsterdam, The Netherlands. e‐mail:m.p.schinkel@uva.nl.;3. Department of Quantitative Economics and CeNDEF, University of Amsterdam, Roetersstraat 11, 1018 WB Amsterdam, The Netherlands. e‐mail:j.tuinstra@uva.nl. |
| Abstract: | This paper introduces the Werden‐Froeb Index (WFI) to assist in evaluating merger‐specific efficiencies in horizontal mergers. The index measures the weighted average reduction in marginal costs required to restore pre‐merger equilibrium prices and quantities after the (full or partial) merger is consummated. The WFI is well defined, objective and robust, and it has relatively low information requirements. We propose to use the index as a natural complement to concentration measures such as the Hirschmann‐Herfindahl Index in the assessment of horizontal mergers. |
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