CHECK DIGIT is a redundant digit added to a code to check accuracy of other characters in the code.
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.
QUALITY is a degree or grade of excellence or worth; can be highly subjective.
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