WIP is an acronym for Work in Process/Progress. Usually refers to inventory that has value added from labor or additional processing. When considered for inventory value, the value of the raw material plus the value added component is accounted for in determining the value of that inventory at that point in the process.
MARGINAL COST is a calculation showing the change in total cost as a result of a change in volume, e.g. if one more item of output increases the total cost by $25, the marginal cost is $25. It is usually useful to determine marginal cost because it can aid in determining if the rate of production should be altered.
FEI is Financial Executive Institute.
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