1. Faculty of Economics and Business Administration, Friedrich Schiller University Jena, Jena, Germany
2. Halle Institute for Economic Research (IWH), Halle (Saale), Germany
3. Centre for Evidence-Based Policy Analysis (IWH-CEP), Halle Institute for Economic Research (IWH), Halle (Saale), Germany
4. Service Center for Research and Transfer, Friedrich Schiller University Jena, Jena, Germany