%S International Library of Critical Writings in Economics %A Jean-Jacques Laffont %A Jean Tirole %J Welfare Economics %T The Regulation of Multiproduct Firm: Part II: Applications to Competitive Environments and Policy Analysis %P 557-586 %B Welfare Economics %E William J. Baumol %E Charles A. Wilson %V III %D 2001 %I Edward Elgar %L publications1092