div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 3button div class=ts-image amp-img class=ts-thumb alt=Page 3: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 4button div class=ts-image amp-img class=ts-thumb alt=Page 4: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 5button div class=ts-image amp-img class=ts-thumb alt=Page 5: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails5jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 6button div class=ts-image amp-img class=ts-thumb alt=Page 6: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails6jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 7button div class=ts-image amp-img class=ts-thumb alt=Page 7: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails7jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 8button div class=ts-image amp-img class=ts-thumb alt=Page 8: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails8jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 9button div class=ts-image amp-img class=ts-thumb alt=Page 9: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails9jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 10button div class=ts-image amp-img class=ts-thumb alt=Page 10: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails10jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 11button div class=ts-image amp-img class=ts-thumb alt=Page 11: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails11jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 12button div class=ts-image amp-img class=ts-thumb alt=Page 12: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails12jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 13button div class=ts-image amp-img class=ts-thumb alt=Page 13: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails13jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 14button div class=ts-image amp-img class=ts-thumb alt=Page 14: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails14jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 15button div class=ts-image amp-img class=ts-thumb alt=Page 15: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails15jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 16button div class=ts-image amp-img class=ts-thumb alt=Page 16: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails16jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 17button div class=ts-image amp-img class=ts-thumb alt=Page 17: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails17jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 18button div class=ts-image amp-img class=ts-thumb alt=Page 18: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails18jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 19button div class=ts-image amp-img class=ts-thumb alt=Page 19: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails19jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 20button div class=ts-image amp-img class=ts-thumb alt=Page 20: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails20jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 21button div class=ts-image amp-img class=ts-thumb alt=Page 21: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails21jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 22button div class=ts-image amp-img class=ts-thumb alt=Page 22: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails22jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 23button div class=ts-image amp-img class=ts-thumb alt=Page 23: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails23jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 24button div class=ts-image amp-img class=ts-thumb alt=Page 24: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails24jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 25button div class=ts-image amp-img class=ts-thumb alt=Page 25: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails25jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 26button div class=ts-image amp-img class=ts-thumb alt=Page 26: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails26jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 27button div class=ts-image amp-img class=ts-thumb alt=Page 27: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails27jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 28button div class=ts-image amp-img class=ts-thumb alt=Page 28: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails28jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 29button div class=ts-image amp-img class=ts-thumb alt=Page 29: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails29jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 30button div class=ts-image amp-img class=ts-thumb alt=Page 30: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails30jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 31button div class=ts-image amp-img class=ts-thumb alt=Page 31: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails31jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 32button div class=ts-image amp-img class=ts-thumb alt=Page 32: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails32jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 33button div class=ts-image amp-img class=ts-thumb alt=Page 33: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails33jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 34button div class=ts-image amp-img class=ts-thumb alt=Page 34: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails34jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 35button div class=ts-image amp-img class=ts-thumb alt=Page 35: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails35jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 36button div class=ts-image amp-img class=ts-thumb alt=Page 36: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails36jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 37button div class=ts-image amp-img class=ts-thumb alt=Page 37: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails37jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 38button div class=ts-image amp-img class=ts-thumb alt=Page 38: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails38jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 39button div class=ts-image amp-img class=ts-thumb alt=Page 39: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails39jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 40button div class=ts-image amp-img class=ts-thumb alt=Page 40: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails40jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 41button div class=ts-image amp-img class=ts-thumb alt=Page 41: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails41jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 42button div class=ts-image amp-img class=ts-thumb alt=Page 42: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails42jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 43button div class=ts-image amp-img class=ts-thumb alt=Page 43: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails43jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 44button div class=ts-image amp-img class=ts-thumb alt=Page 44: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails44jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 45button div class=ts-image amp-img class=ts-thumb alt=Page 45: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails45jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 46button div class=ts-image amp-img class=ts-thumb alt=Page 46: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails46jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 47button div class=ts-image amp-img class=ts-thumb alt=Page 47: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails47jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 48button div class=ts-image amp-img class=ts-thumb alt=Page 48: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails48jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 49button div class=ts-image amp-img class=ts-thumb alt=Page 49: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails49jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 50button div class=ts-image amp-img class=ts-thumb alt=Page 50: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails50jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 51button div class=ts-image amp-img class=ts-thumb alt=Page 51: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails51jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 52button div class=ts-image amp-img class=ts-thumb alt=Page 52: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails52jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 53button div class=ts-image amp-img class=ts-thumb alt=Page 53: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails53jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 54button div class=ts-image amp-img class=ts-thumb alt=Page 54: National Bureau of Economic Research · Created Date: 8201998 12:37:41 AM src=https:reader033vdocumentinreader033viewer20220528005f0f363a7e708231d4430a5dhtml5thumbnails54jpg width=142 height=106 layout=responsive amp-img divdiv