黑池是新金融市场的另一个流氓产卵。由大经纪人经营的私人证券交易所，他们不需要向公众透露内部发生了什么。他们报告了他们执行的任何贸易，但是他们这样做了足够的延迟，以至于不可能确切知道贸易发生时更广泛的市场发生了什么。
(Dark pools were another rogue spawn of the new financial marketplace. Private stock exchanges, run by the big brokers, they were not required to reveal to the public what happened inside them. They reported any trade they executed, but they did so with sufficient delay that it was impossible to know exactly what was happening in the broader market at the moment the trade occurred.)