However, since the 1970s the best-known official studies in the West have shown that short-selling is broadly a force for good, aiding price discovery and preventing shares from becoming overvalued.

然而，自1970年代以来，西方的权威研究表明，空头是一股有益的力量，它可以防止股票价值被高估，寻找合理的股价。

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Under Abacha, pumps ran dry and the president's friends made fortunes cornering supplies at the low official price and selling them at the much higher black-market rate.

ECONOMIST: A survey of Nigeria