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1、CHAPTER6InventoryManagementPurposesofInventoryEnablesthefirmtoachieveeconomicsofscaleBalancessupplyanddemandEnablesspecializationinmanufacturingProvidesprotectionfromuncertaintiesindemandandordercycleActsasabufferbetweencriticalinterfaceswithinthesupplychain2004000Days10203040
2、5060InventoryOrderplacedOrderarrivalOrderplacedAveragecycleinventoryA.Orderquantityof400unitsOrderarrivalTheEffectofReorderQuantityon AverageInventoryInvestmentwithConstantDemandandLeadTimea6-3aInventoryOrderplacedOrderarrivalAveragecycleinventoryDays1020304050600100200B.Order
3、quantityof200unitsTheEffectofReorderQuantityon AverageInventoryInvestmentwith ConstantDemandandLeadTimeb6-3bAveragecycleinventoryOrderarrivalOrderplacedC.Orderquantityof600unitsDays102030405060Inventory0300600TheEffectofReorderQuantityon AverageInventoryInvestmentwith Constant
4、DemandandLeadTimec6-3cAverageInventoryInvestmentUnderConditionsofUncertaintyA.WithvariabledemandInventoryAveragecycleinventorySs(afetytock50)yAverageinventor(150)200100810203040Days{{a6-4aAverageInventoryInvestmentUnderConditionsofUncertaintyB.WithvariableleadtimeInventoryAver
5、agecycleinventoryyAverageinventor(140)2001001012{203040DaySs(afetytock40)s{b6-4bC.WithvariabledemandandleadtimeInventoryAveragecycleinventoryyAverageinventor(200)2001001012{203040DayySs(afet0tock10)s{8AverageInventoryInvestmentUnderConditionsofUncertaintyc6-4cEOQ=2PDCVwhere:P=
6、Theorderingcost(dollarsperorder)D=Annualdemandorusageoftheproduct(numberofunits)C=Annualinventorycarryingcost(asapercentageofproductcostorvalue)V=AveragecostorvalueofoneunitofinventoryTheEOQModel6-5SizeoforderAnnualcost(dollars)Lowesttotalcost(EOQ)TotalcostInventorycarryingcos
7、tOrderingcostCostTrade-offstoDeterminethe MostEconomicOrderQuantity6-6OrderQuantityNumberofOrders(D/Q)OrderingCostPX(D/Q)InventoryCarryingCost1/2QXCXVTotalCost406080100120140160200300400120806048403530241812$4,8003,2002,4001,9201,6001,4001,200960720480$5007501,0001,2501,5001,7
8、502,0002,5003,7505,000$5,3003,9503,4003,1703,1003,1503,2004,4
