00346nam a2200133 a 450000500170000000800410001704100080005808200120006610000190007824500350009726400400013230000110017265000290018320260717090926.0260717s1969    ii            000 0 eng d  aeng04a338.5211 aRyan, W. J. L.10aPrice theory /cRyan, W. J. L. 1aLondon :bMacmillan and Co.,c1969.  a396 p. 4aEconomics - price theory