理论上，证券评估机构和数学模型帮助投资者评价自身的风险，即使手中的股票很少进行交易。
In theory, ratings agencies and mathematical models help investors price the risk they are taking on, even if the securities they are buying are scarcely traded.
但是关于FSA现在最重要的职责：市场和证券交易监管则很少提及。
Little mention is made of a big chunk of the FSA's current duties: oversight of the markets and securities trading.
伦敦(证券交易所)的数据很少公开，但是好在它标注了股票借贷水平(如果押注股价下跌，空头常常会拆借股票，并把它卖掉)。
Data for London are less transparent, but the best proxy is the level of shares being lent (to bet on a share price falling, short-sellers often borrow stock and then sell it).
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