1. Centro de Economía Aplicada, Universidad de Chile, Santiago, Chile.
2. Research Department, Federal Reserve Bank of Minneapolis, Minneapolis, MN 55480, Department of Economics, University of Minnesota, and National Bureau of Economic Research.
3. Department of Economics, University of Minnesota, Minneapolis, MN 55455, and Research Department, Federal Reserve Bank of Minneapolis.
4. Instituto de Economía, Pontificia Universidad Católica de Chile, Santiago, Chile.