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Collusive networks in market sharing agreements in the presence of an antitrust authority

  • Flavia Roldán

    ()

This paper studies how the presence of an antitrust authority affects market-sharing agreements made by firms in oligopolistic markets. These agreements prevent firms from entering each other´s market. The set of market-sharing agreements defines a collusive network, which is under suspicion by antitrust authorities. This paper shows that, from the firm´s point of view, the probability of being caught is endogenous and depends on the agreements each firm has signed. Stable collusive networks can be decomposed into a set of isolated firms and complete alliances of different sizes. While in the absence of the antitrust authority, a network is stable if its alliances are large enough, when the antitrust authority is considered, the network is stability depends on the network configuration as a whole. Antitrust laws may have a pro-competitive effect as they give Firms in large alliances more incentives to cut their agreements at once.

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File URL: http://e-archivo.uc3m.es/bitstream/10016/3086/1/we085024.pdf
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Paper provided by Universidad Carlos III, Departamento de Economía in its series Economics Working Papers with number we085024.

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Date of creation: Sep 2008
Date of revision:
Handle: RePEc:cte:werepe:we085024
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  16. Matthew O. Jackson, 2001. "Strongly Stable Networks," University of Oregon Economics Department Working Papers 2001-3, University of Oregon Economics Department, revised 15 Nov 2002.
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