该模型可涵盖整个市场范围，可卖空（跌价下注）以及买进，因此该理论认为总是存在某种可以利用的趋势。
The model can range across markets and go short (bet on falling prices) as well as long, so the theory is that there will always be some kind of trend to exploit.
卖空也能够帮助阻止市场泡沫的形成。
在金融危机期间，英国、美国和欧洲其它国家全都限制卖空交易，因为担忧卖空交易会加剧市场(尤其是金融类股)的暴跌。
UK, US and European nations all clamped down on short selling during the crisis over fears it was exacerbating market slumps, particularly in financial stocks.
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