# 計算要花多少年才能讓投資價值倍增,有一個簡單的方法,就是用七二除以年報酬率。例如,某筆投資的年報酬是九%,每八年價值就會增為兩倍(72÷9=8)。同樣地,某筆投資年報酬是一二%,每六年價值就增為兩倍,年報酬率若是一八%,每四年價值就增為兩倍。——《賺錢,也賺幸福》
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