00255nam a2200109Ia 4500082001900000100001800019245004100037260004200078300001500120500000500135700000500140  a330.1bL767.IP  aLipsey, R. G.  aIntroduction to positive economicsb  aLondonbWeidenfeld and Nicolsonc1963  axvi, 559p.  a  a