Stephen Salant University of Michigan   Lorch Hall, room 254, 611 Tappan Street Lorch Hall, room 254, 611 Tappan Street Ann Arbor, MI 48109 USA   ssalant@umich.edu   http://www-personal.umich.edu/~ssalant/       Primary Research Focus: Applied micro   JEL Areas: D : Microeconomics L : Industrial Organization