The cost that he incurs in this decision, then, is only ex ante; as soon as his decision is made and the choice is exercised and his resource committed, the cost disappears.
那么，由他的决定所引起的成本只出现在事前；一旦他作出决定，并投入资源行动起来，成本就消失了，成为历史成本，永远地消失了。
For an individual's cost is subjective and ephemeral; it appears only ex ante, at the moment before the individual makes a decision.
一个人的成本是主观的，转瞬即逝。它只出现在事前，即在人作出决定之前。
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