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Bern: Huber, 2014
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Princeton, NJ [u.a.]: Princeton Univ. Press, 2008
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Cambridge, Mass: National Bureau of Economic Research, September 2002
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Cambridge, Mass: National Bureau of Economic Research, January 2017
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Cambridge, Mass: National Bureau of Economic Research, October 2017
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Cambridge, Mass: National Bureau of Economic Research, February 2017
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Cambridge, Mass: National Bureau of Economic Research, June 2015
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Cambridge, Mass: National Bureau of Economic Research, May 2014
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Cambridge, Mass: National Bureau of Economic Research, May 2014
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Cambridge, Mass: National Bureau of Economic Research, May 2014
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Cambridge, Mass: National Bureau of Economic Research, May 2014
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Cambridge, Mass: National Bureau of Economic Research, May 2012
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Cambridge, Mass: National Bureau of Economic Research, January 2012
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Cambridge, Mass: National Bureau of Economic Research, May 2012
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Princeton, N.J: Princeton University Press, 2010 ; 2011
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Cambridge, MA: National Bureau of Economic Research (NBER), 2009
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Cambridge, Mass: National Bureau of Economic Research, January 2007
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Cambridge, Mass: National Bureau of Economic Research, September 2007
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Cambridge, Mass: National Bureau of Economic Research, June 2006
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Cambridge, Mass: National Bureau of Economic Research, January 2004