Unlimited shorting was made possible by the 2007 abolition of the uptick rule (which hindered bear raids by allowing short-selling only when prices were rising).

2007年“提价交易规则”(uptick rule)(只有在股价上涨时才允许卖空股票，从而阻止空头袭击)的废除，使无限卖空成为可能。

youdao

Now it was the weapons of finance that he used, cornering shares and launching blistering bear raids to beat off equally merciless rivals.

这一次他用的是金融武器：垄断股价，实行猛烈快速的“空头袭击”策略打退同样冷酷的竞争对手。

youdao

As bear raids can be self-validating, they ought to be kept under control.

由于空头袭击可以自我验证，它们应处于控制之下。

youdao

Naked short-selling also intensifies bear raids by making it easier for traders to short stocks, since they do not actually borrow the shares in advance.

FORBES: Intelligent Investing Briefing Book