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기회비용 [機會費用, opportunity cost]
Opportunity cost is a term used in economics to mean the cost of something in terms of an opportunity forgone (and the benefits that could be received from that opportunity), or the most valuable forgone alternative.
한번뿐일지 모르는 사랑 vs 영원할것 같은 우정
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사랑에는 이성이 통하질 않어.
나도 모르게 감정적이 되는 걸...