Working papers series Department of Economics WP ECON 09.02 Public Disclosure Programs vs. Traditional Approaches for Environmental Regulation: Green Goodwill and the Policies of the Firm Francisco J. André (U. Pablo de Olavide) Abderrahmane Sokri (DRDC Centre for Operational Research and Analysis, Ottawa, Canada) Georges Zaccour (Chair in Game Theory and Management and GERAD,HEC Montréal, Canada) JEL Classification numbers: C61, Q58 Keywords: Market-based Environmental Regulation, Public Disclosure Program, Pricing, Advertising, Goodwill, Optimal Control.