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Demand for Services

Service demand is unique because the demand characteristics are not known until the demand is created. For example, a drawing for a new product cannot be produced until the product is defined. In this sense, the demand for services is always backordered. There can be no stock inventory to satisfy service demand. There is no stock of, for instance, maintenance calls on a crane to repair the lift motor. The maintenance call is not provided until the crane lift motor breaks.