First Author:   Carsten Schmidt University of Mannheim, Sonderforschungsbereich 504 cschmidt@sfb504.uni-mannheim.de   L13,15 Mannheim, 68131, Germany       http://www.sfb504.uni-mannheim.de/~cschmidt Second Author: Ro'i Zultan The Hebrew University of Jerusalem, Center for Rationality and School of Education sultan@math.huji.ac.il   Givat Ram Jerusalem, 91904, Israel