00534nam a2200169Ia 4500082002500000100005100025245008200076260003000158300001300188500000500201690000600206700000500212952010600217964001700323921000900340999001500349  a330.072(73)bN277.ER  aNational Bureau of Economic Research, New York  aEconomic research and the development of economic science and public policyb  aNew YorkbThe Auth.c1946  ax, 198p.  a  a   a  00104070aISIbISId1998-06-10l0o330.072(73) N277.ERpDP7376r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a2068  c2068d2068