00274nam a2200109Ia 4500082002100000100001900021245005100040260004800091300001500139500000500154700000500159  a338.016bP917.ES  aPratten, C. F.  aEconomies of scale in manufacturing industryb  aCambridgebCambridge University Pressc1971  axii, 352p.  a  a