00561nam a2200145Ia 4500008004100000010001200041040001700053082002500070100002000095245006800115260004500183300001500228440003600243650013600279190328s9999||||xx |||||||||||||| ||und||  a57-6351  aNITILcNITIL  221sta338.523bM398E  aMason, Edward S 0aEconomic concentration and the monopoly problemcEdward S Mason  aCambridgebHarvard Univesity Pressc1957  axvi, 411p.  aHarvard economic studies; vol.C  aMonopolies; Big business; Industrial concentration; Raw materials; Price regulation; Full employment policies; Economic development