“Reforming European Merger Review: Targeting Problem Areas in Policy Outcomes”, Journal of Industry, Competition, and Trade, Vol. 2 (4), pp. 311-364, 2002.
“`Good economics’ in administrative proceedings: Three challenges”, Concurrences – Review of Competition Laws, www.concurrences.com N° 3-2013.
“Fighting Collusion by Regulating Communication between Firms”, Economic Policy, 32, pp. 169-204, April 2001.
“Collusion Theory in Search of Robust Themes: A Comment on Switgard Feuerstein’s survey”, Journal of Industry, Competition, and Trade, Vol. 5 (3/4), pp. 207-215, 2005.
“The Comparative Statics of Collusion Models”, August 2008, (with M. Rimler, Xavier University)
“How Market Fragmentation Can Facilitate Collusion’’, Journal of the European Economic Association, Vol. 10, pp 1116–1140, October 2012.
“Communication, Renegotiation, and the Scope for Collusion”, (with D. Cooper, Florida State University), American Economic Journal: Microeconomics, May 2014
“Communication and Cooperation: A Methodological Study”, (with D. Cooper), Southern Economic Journal, Vol. 82, pp. 1167 – 1185, April 2016
"Information Exchanges Among Firms and their Impact on Competition", Office for Official Publications of the European Community: Luxemburg, 1995. (With X. Vives, IAE).
“Market Transparency and Information Exchange”, in: Actas de las XI Jornadas de Economia Industrial, Fundadcion Empresa Publica, Madrid, pp. 93-98, January 1996. (With C. Martinez, Lexecon Ltd., London).
“The Cost of Simplistic Rules For Assessing Information Exchanges: The Italian JetFuel Decision” (with Cristina Caffarra), in: The Pros and Cons of Information Exchange, Swedish Competition Authority, Stockholm, 2006.
“Designing Competition Policy towards Information Exchanges – Looking Beyond the Possibility Results”, OECD Policy Roundtable: Information Exchanges Between Competitors under Competition Law, 2010.
“Joint Dominance: The CFI Judgement on Gencor/Lonrho”, European Competition Law Review, 1999. (With C. Caffarra, Lexecon Ltd., London).
“Closing Pandora’s Box? Joint Dominance after the Airtours Judgement”, in The Pros and Cons of Merger Policy, Swedish Competition Authority, Stockholm, 2002.
“The Coordinated Effects of Mergers”, in: Paolo Buccirossi (ed.): “Handbook of Antitrust Economics”, MIT Press. 2008.
“Capacity Constraints and Irreversible Investments: Defending against Collective Dominance in UPM Kymmene/Norske Skog/Haindl”, (with John Van Reenen). in: Bruce Lyons (ed.): Cases in European Competition Policy: The Economic Analysis, Cambridge University Press, 2009.
“On the Coordinated Effects of Conglomerate Mergers”, mimeo, March 2009
“The Coordinated Effects of Mergers in Differentiated Products Markets”, accepted subject to minor revision at Rand Journal of Economics.
“Economic Theories of Bundling and Their Policy Implications in Abuse Cases” (With Bob Stillman and Cristina Caffarra), European Competition Journal, Vol. 1, pp. 85 – 122, March 2005.
“Interoperability and Market Foreclosure in the European Microsoft Case”, (with John Van Reenen). in: Bruce Lyons (ed.): Cases in European Competition Policy: The Economic Analysis, Cambridge University Press, 2009.
“Levering Monopoly Power by Limiting Interoperability: Theory and evidence from computer markets”, (with C. Genakos and J. Van Reenen), August 2010, Cambridge University NBER working paper, Revise and Resubmit, Economica.
"Excess Entry, Vertical Integration, and Welfare”, The RAND Journal of Economics, Vol 30 (4), pp. 575-603, Winter 1999. (With X. Vives, IAE, Barcelona).
“Economic Deficits in the Competition Analysis of e-Commerce: Is the Current Enforcement Practice Justified from an Economic Perspective?”, forthcoming, Competition Law and Policy Debate.
“Standard Setting Organizations Can Help Solve the Standard Essential Patents Licensing Problem” (with F. Scott-Morton and H. Shelanski), CPI Antitrust Journal, March 2013.
“Justifying Antitrust Intervention in ICT Sector Patent Disputes: How to Address the Hold-Up Problem”, CPI Antitrust Journal, December 2013.
"¿Ha Llegado la Competencia? - Un análisis económico de la reforma del sector eléctrico en España", Informes del IAE, Vol. 1, Institut d´Anàlisi Econòmica (CSIC), Barcelona, Spain, January 1998. (With P. Regibeau, IAE).
"Regulatory Reform in the Spanish Electricity Industry: A Missed Opportunity for Introducing Competition", Energy Policy, Vol. 27 (7), pp. 387-399, November 1999. (With P. Règibeau, Essex University, and P. Arocena, Universidad Publica de Navarra).
“Bilateral Market Power and Vertical Integration in the Spanish Electricity Market”, July 2004 (revised 2008, 2010), CEPR Discussion Paper 4590. (With M. Machado, Universidad Carlos III, Madrid).
"Competition Policy and Regulation in Liberalized Industries: The Case of Postal Services", May 1998, Kings College London Discussion Paper Series. (With B. Bishop, Lexecon Ltd.; C. Caffarra, Lexecon Ltd.; and R. Wish, Kings College, London).
"Regular para crear la competencia: La liberalización de las telecomunicaciónes en España" in: A. Mas-Colell and M. Motta eds.: "Nuevas Fronteras de la Politica Economica, 1998", CREI, Generalitat de Catalunya y Universitat Pompeu Fabra, Barcelona, May 1999.
"Competition Policy Research: Where Do We Stand?", CEPR Occasional Paper No. 8, August 1992. (With P. Seabright, Cambridge University, and A. Smith, University of Sussex).
"Sobre el papel de la teoria economica en la politica de la competencia", Cuadernos Economicos de I.C.E., Vol. 57 (2), pp. 9-29. November 1994.
"Protecting the Freedom to Compete - An Overview of German Competition Policy", published as "Germany" in E.M. Graham and D. Richardson eds. "Global Competition Policy and the World Economy", Institute for International Economics, Washington D.C., 1997.
Book Review of “P. McNutt: Law, Economics, and Antitrust: Towards a New Perspective”, International Journal of Social Economics, Vol. 33 (11/12), pp. 860-862, 2006.
“Economics at DG Competition 2010-2011”, (with S. Albaek and M. de la Mano), Review of Industrial Organization, 39, pp. 311-325, December 2011.
“Economics at DG Competition 2011-2012”, (with S. Lorincz, V. Verouden, and A. Wilpshaar), Review of Industrial Organization, 41, pp. 251-270, December 2012.
“Economics at DG Competition 2012-2013”, (with T. Buettner, G. Federico, and D. Magos), Review of Industrial Organization, 43, pp. 265-290, December 2013.