00327nam a2200133 a 450000500170000002000150001708200130003210000230004524500390006825000120010726000230011930000280014263000230017020251203090646.0  a0297782665  a330bLIP  aLipsey, Richard G.  aIntroduction to positive economics  a6th Ed.  aLondonbELBSc1983  axxv, 790 p.c22 cm.bPB  aPositive economics