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限界効用 - Wikipedia
http://ja.wikipedia.org/wiki/%E9%99%90%E7%95%8C%E5%8A%B9%E7%94%A8
収穫逓減 - Wikipedia
http://ja.wikipedia.org/wiki/%E5%8F%8E%E7%A9%AB%E9%80%93%E6%B8%9B
富士生命|逓減定期保険(特徴)
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