缺少小公司股票的代价昂贵，因为对冲基金很难找到可以借入的股票。
Shorting the shares of smaller firms is expensive because it is hard to find shares to borrow.
第二，小公司股票比大公司股票更容易发生反转。第三，市场态势为上升状态时的反转效应要显著大于市场态势为下降状态时。
Secondly, the reversal effect in small-size firm stocks is more significant than the reversal effect in large-size firm stocks.
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