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/ \textbf{平均增益率(乘法):}
\textbf{平均增益率(乘法):}
February 22, 2026
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\[ (1 + r)^1 = \frac{\text{终值}}{\text{初值}} = \frac{10}{10} = 1 \]
{{ WAIT: 若第二年不变,r=0.}}。
假设第一年涨25%(valuation $12.5),第二年价格变动但未明确,设为涨跌均摊:
各期增益因子:1.25 × 0.8 = 1.00
年化增益率 = \( 1.00^{1} - 1 = 0\% \)
题目:** 某投资者以20美元/股买入500股(总额1000美元)。第一年股价上涨25%至30美元,第二年下跌20%至24美元,第二年底卖出全部股票。计算年化收益率。
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