[1] Katholieke Univ Leuven, Dept Managerial Econ Strategy & Innovat, B-3000 Louvain, Belgium
[2] Katholieke Univ Leuven, Ctr R&D Monitoring ECOOM, B-3000 Louvain, Belgium
[3] Ctr European Econ Res ZEW, Mannheim, Germany
[4] Univ Maastricht, Dept Org & Strategy, NL-6211 LM Maastricht, Netherlands
[5] Copenhagen Business Sch, Dept Econ, CEBR, DK-2000 Copenhagen, Denmark