First Author:   Rainald Borck Humboldt University Berlin borck@wiwi.hu-berlin.de   Humboldt University, Dept. of Economics, Spandauer Str. 1 10178 Berlin, Germany   +49-30-20935676(Phone) +49-30-20935676(Fax) http://www.wiwi.hu-berlin.de/~borck