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两个基金期望回报8%，但 \sigma_A = 5\% 和 \sigma_B = 15\% 。作为风险厌恶者，选择哪个？为什么？
两个基金期望回报8%，但 \sigma_A = 5\% 和 \sigma_B = 15\% 。作为风险厌恶者，选择哪个？为什么？
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