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*Ed can fix tone
Standard diff-in-diff references:
*Ashenfelter and Card (1985): http://davidcard.berkeley.edu/papers/train-prog-estimates.pdf
*Card and Kruger (1995): http://www.eco.uc3m.es/docencia/EconomiaAplicada/materiales/CardKrueger94_en.pdf
=Version 2=

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