1. Division of Economics, Stirling Management School, University of Stirling, Cottrell Building, Stirling, Scotland FK9 4LA
2. Welsh Economy Research Unit, Cardiff University, Colum Drive Office T02, Cardiff CF10 3EU, Wales
3. Department of Economics, University of Strathclyde, Sir William Duncan Building, 13 Rottenrow, Glasgow G4 0GE, Scotland
4. Regional Research Institute, Department of Economics, West Virginia University, PO Box 6825, Morgantown, WV 26506, USA