00859nas 2200325 c 450 991014281210332120251012103903.0(DE-599)ZDB2005416-6(OCoLC)1368062963(DE-101)020150679(CKB)1000000000531342(EXLCZ)99100000000053134220000225a19979999 |y |engur|||||||||||txtrdacontentcrdamediacrrdacarrierNBER digest onlineNational Bureau of Economic ResearchCambridge, Mass.NBER1997-Online-RessourceZeitschriftgnd-content3300021DE-1019999JOURNAL9910142812103321NBER Digest OnLine2237211UNINA