Odile Poulsen University of East Anglia   School of Economics University of East Anglia Norwich , NR4 7TJ United Kingdom   o.poulsen@uea.ac.uk   http://www.uea.ac.uk/%7Eec609/odileweb1.HTM           JEL Areas: O4 : Economic Growth and Aggregate Productivity: General E : Macroeconomics and Monetary Economics