First Author:   Alex Coad Max Planck Institute of Economics, Jena, Germany coad@econ.mpg.de   Max Planck Institute of Economics, Evolutionary Economics Group, Kahlaische Strasse 10 Jena, D-07745, Germany   +49 3641 686822(Phone) +49 3641 686822(Fax) http://www.econ.mpg.de/english/staff/staffpage.php?group=evo&name=coad