DEDUCTION is the act of deducting; subtraction. It is an amount that is or may be deducted, e.g. tax deductions.
X-INEFFICIENCY is the failure to minimize costs or maximize returns. (Sometimes referred to as X-efficiency, but carrying the same meaning.)
INCUR is acquiring or getting into something undesirable or making oneself subject to; bring upon oneself; become liable to, e.g. to incur a cost or debt.
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