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/ 净额:0,**但考虑价格波动,计算折现率?
净额:0,**但考虑价格波动,计算折现率?
February 22, 2026
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改造:假设第一年涨25%,价格成为 1.25美元,卖出,哪怕第二年下跌,设价格为新 cost basis,but motion为以市价为基。
题目:** 某投资者买入1000股,单价 $10,持有一年后股价分别为:第一年上涨25%至 $12.5,第二年下跌20%至 $10,卖出全部股票。若按平均成本计算,是否盈利?求年化收益率。
初始投入:1000 × 10 = 10,000
更优:用** geometric mean return
年终市价 = $10 × 1.25 × 0.8 = $10
\[ (1 + r)^1 = \frac{\text{终值}}{\text{初值}} = \frac{10}{10} = 1 \]
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