Volker Grossmann University of Fribourg   Department of Economics University of Fribourg Bd. de Pérolles 90, G 424 Fribourg, CH-1700 Switzerland   volker.grossmann@unifr.ch             JEL Areas: E2 : Macroeconomics: Consumption, Saving, Production, Employment, and Investment: General (includes Measurement and Data) O3 : Technological Change; Research and Development: General