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Cambridge, Mass: National Bureau of Economic Research, November 2008
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Cambridge, Mass: National Bureau of Economic Research, September 2008
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Cambridge, Mass: National Bureau of Economic Research, June 2006
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München: ifo Institut für Wirtschaftsforschung an der Universität München, 2007
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Cambridge, Mass: National Bureau of Economic Research, July 2006
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Cambridge, MA: National Bureau of Economic Research (NBER), 2006
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Cambridge, Mass: National Bureau of Economic Research, November 2007
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Cambridge, Mass: National Bureau of Economic Research, April 2007
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Cambridge, Mass: National Bureau of Economic Research, October 2006
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Cambridge, Mass: National Bureau of Economic Research, February 2006
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Cambridge, Mass: National Bureau of Economic Research, June 2005
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Cambridge, Mass: National Bureau of Economic Research, October 2005
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Cambridge, Mass: National Bureau of Economic Research, August 2005
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Cambridge, Mass: National Bureau of Economic Research, September 2005
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Cambridge, Mass: National Bureau of Economic Research, April 2005
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Cambridge, Mass: National Bureau of Economic Research, January 2004
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Cambridge, Mass: National Bureau of Economic Research, June 2003
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Cambridge, Mass: National Bureau of Economic Research, February 2004
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Cambridge, Mass: National Bureau of Economic Research, March 2004
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Cambridge, Mass: National Bureau of Economic Research, February 2003