00441nam a2200145 a 450000500170000000800410001704100080005808200080006610000230007424500640009726400420016130000270020350000510023065000140028120260717090731.0260717s1968    ii            000 0 eng d  aeng04a3301 aLipsey, Richard G.13aAn introduction to positive economics /cLipsey, Richard G. 1bEnglish Language Book Society,c1968.  axxiii, 872 p. ; 24 cm.  aIncludes Bibliographical footnotes. and index. 4aEconomics