Jacomo Corbo Wharton, University of Pennsylvania   3730 Walnut Street 555 Jon M. Huntsman Hall Philadelphia, PA 19104 United States   jacomo@wharton.upenn.edu   http://opim.wharton.upenn.edu/~jacomo/       Primary Research Focus: adoption and influence models, network formation, local public goods   JEL Areas: C7 : Game Theory and Bargaining Theory:General D4 : Market Structure and Pricing: General