00306n   a2200121 a 4500000002100000001000700021005001700028082002000045100002300065245004600088260003600134300001400170B B                 02091120220202114225.0  a330.068bP4 ECO  aWebster, Thomas J.  aManagerial EconomicsbTheroy and Practice  aNew DelhibAcademic Pressc2004  axiv,739p.