Merger simulations with observed diversion ratios
AbstractA common approach to merger simulations used in antitrust cases is to calibrate demand from market shares and a few additional parameters. When the products involved in the merger case are differentiated along several dimensions, the resulting diversion ratios may be very different from those based upon market shares. This again may affect the predicted post-merger price effects. This article shows how merger simulation can be improved by using observed diversion ratios. To illustrate the effects of this approach we use diversion ratios from a local grocery market in Norway. In this case diversions from the acquired to the acquiring stores were considerably smaller than suggested by market shares, and the predicted average price increase from the acquisition was 40 % lower using this model rather than a model based upon market shares. This analysis also suggests that even a subset of observed diversion ratios may significantly change the prediction from a merger simulation based upon market shares.
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Bibliographic InfoPaper provided by Department of Economics, Norwegian School of Economics in its series Discussion Paper Series in Economics with number 27/2010.
Length: 31 pages
Date of creation: 30 Sep 2010
Date of revision:
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Merger simulation; diversion ratio; asymmetric differentiation; merger policy.;
Other versions of this item:
- K21 - Law and Economics - - Regulation and Business Law - - - Antitrust Law
- L11 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Production, Pricing, and Market Structure; Size Distribution of Firms
- L41 - Industrial Organization - - Antitrust Issues and Policies - - - Monopolization; Horizontal Anticompetitive Practices
This paper has been announced in the following NEP Reports:
- NEP-ALL-2011-05-14 (All new papers)
- NEP-CMP-2011-05-14 (Computational Economics)
- NEP-COM-2011-05-14 (Industrial Competition)
- NEP-IND-2011-05-14 (Industrial Organization)
- NEP-LAW-2011-05-14 (Law & Economics)
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Discussion Paper Series in Economics
27/2010, Department of Economics, Norwegian School of Economics.
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