The stock market goes up and down. Suppose its level alternates each year between 50 and 100, with no upward or downward trend. What is the capital return on the market?
股市有漲也有跌。假設每年的股價不是50就是100,沒有上漲或下跌趨勢。那麼股市的資本回報率會有多大?
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