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In many inventory management systems, situations arise in which ordering time and ordering quantity of an item are interrelated with those for other items. In some of these cases, consideration of the interrelationship among items is mandatory. This can happen for a group of items, for instance, if there is a budgetary limit on the total dollar value of inventory that may be carried for the group, or if a limit exists on warehouse capacity available for storing items in the group.' In other cases, consideration of the interrelationship is optional, the interrelationship being considered only when the added complexity in decision-making is outweighed by the added benefits expected to be gained.
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