000 00331nam a2200181 4500
020 _a
_c
082 _a330 QUA
100 _a
245 _aQuartely journal of economics 1970, Vol.684
250 _a
260 _a
_c
300 _a
490 _a
500 _a
590 _a
_b
_c
650 _aEconomics
942 _cBK
999 _c314200
_d314200