Tax expenditures are the revenues forgone due to preferential tax treatment.

稅收支出是由于稅收優(yōu)惠待遇而放棄的收入.

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The alternative forgone is called the opportunity cost.

這種選擇性的放棄就叫做機會成本.

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Cost is the highest - valued option forgone.

成本是在放棄的選擇中價值最高的選擇.

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