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Very early in our childhood we are taught that you can't have your cake and eat it, and this is only putting in another way the fact that you can't use the same resources to produce two separate things at the same time. ... You have to choose which of the many possible uses to which you could put the same materials or the same time is the one you prefer, in the knowledge that the price you pay consists of all the other alternatives you have thereby given up.
――英文和訳演習 上級篇 伊藤和夫 駿台文庫
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