Contributions by: Tibor Besedeš, Volker Nitsch, Enrico Spolaore, Romain Wacziarg, Arthur Silve, Thierry Verdier, Julian Hinz, Tristan Kohl, Chiel Klein Reesink, Daniel P. Ahn, Rodney D Ludema, Kilian Heilmann, Chenmei Li, Peter A. G. van Bergeijk, Maria Persson, Wolfgang Hess, Melise Jaud, Madina Kukenova, Martin Strieborny, Marvin Suesse