First Author:   Johannes Tiwisina Bielefeld University ebimworkshop@uni-bielefeld.de   Institute of Mathematical Economics, Bielefeld University, Postfach 100131 Bielefeld, 33615, Germany       http://www.bigsem.de/ebim/workshop/ Second Author: Johannes Tiwisina Bielefeld University ebimworkshop@uni-bielefeld.de