Rosa Branca Esteves Universidade do Minho and NIPE   Escola de Economia e Gestão Universidade do Minho Campus de Gualtar Braga, 4710-057 Portugal   rbranca@eeg.uminho.pt     Biographical Sketch: PhD in Economics, Oxford University   Primary Research Focus: Competitive Price Discrimination, Advertising   JEL Areas: L0 : Industrial Organization: General