Krzysztof R. Apt Centrum Wiskunde & Informatica (CWI) and University of Amsterdam   K.R. Apt CWI Amsterdam, 1098 XG The Netherlands   apt@cwi.nl   http://www.cwi.nl/~apt   Biographical Sketch: I am a computer scientist who got interested in 2003 in game theory.   Primary Research Focus: Game theory, mechanism design   JEL Areas: C7 : Game Theory and Bargaining Theory:General C7 : Game Theory and Bargaining Theory:General