Sustainability in a Multiproduct and Multiple Agent Contestable Market Vincent Iehlé Partial Privatization in a Mixed Duopoly with an R&D Rivalry John S. Heywood and Guangliang Ye R&D Cooperation with Unit-Elastic Demand Georg Gétz and Anna Hammerschmidt A Rule for Aggregating Individual Welfare Measures Alberto Pench Is Trade in Technology Superior to Trade in Goods? Sugata Marjit and Hamid Beladi Number 3, July 2009 ARTICLES: Envy, Institutions and Growth Michael Mitsopoulos On Consumers’ Valuation of Nutrition Information Andreas C. Drichoutis, Panagiotis Lazaridis and Rodolfo M. Nayga Jr Public Programs Pare Poverty: Evidence from Chile David Glick and Nidhiya Menon Commodity Tax Structure and Informal Activity Sophia Delipalla Gambling with Tax Dollars Rudy Santore Number 4, October 2009 ARTICLES: Understanding Labour Market Frictions: An Asset Pricing Approach Parantap Basu Hysteresis in Unemployment Revisited: Evidence from Panel LM Unit Root Tests with Heterogeneous Structural Breaks Jun-De Lee, Chien-Chiang Lee and Chun-Ping Chang Health Improvements and the Transition Out of Malthusian Stagnation Luis Currais, Berta Rivera and Paolo Rungo Does Teacher Quality Affect Student Performance? Evidence from an Italian University Maria De Paola Traffic Management in Wholesale International Roaming: Towards a More Efficient Market? Paolo Lupi and Fabio M. Manenti