federal reserve bank of san francisco working paper series the views in this are solely responsibility authors and should not be interpreted as reflecting or board governors system labor supply personal computer adoption mark doms ethan lewis philadelphia june 2006 18 http www frbsf org publications economics papers wp06 18bk pdf 3 sf frb g phil would like to thank meryl motika shannon mail for excellent research assistance also daron acemoglu orley ashenfelter david autor paul beaudry marianne bitler elizabeth cascio mary daly ellen dulburger fred furlong shane greenstein erica groshen chang tai hsieh pete klenow betsey stevenson anita todd robert valletta phillip vermuellen justin wolfers seminar participants at 2005 nber summer institute assa meetings sole ubc wrsa