00329nam a2200121Ia 4500020001500000082001900015100002200034245008000056260003400136300002700170500000500197700000500202  a0631114114  a338.5bL244.VE  aLancaster, Kelvin  aVariety, equity, and efficiency; product variety in an industrial societyb  aOxfordbBasil Blackwellc1979  axi, 373p. Index. Bibl.  a  a