It is now forthcoming the paper:
Doni N. and Ricchiuti G. (2013) ‘Market Equilibrium in the Presence of Green Consumers and Responsible Firms: a Comparative Statics Analysis’, Resource and Energy Economics, vol. 35 issue 3 pp 380-395 (preliminary version WP07/2011, Dipartimento Scienze Economiche, Università di Firenze)
Buona Lettura!
GR