There is more grit on the horizon. In a penetrating analysis of the “Flash Crash” of May 6, 2010, when the Dow lost $1 trillion of market value in 30 minutes, Andy Haldane of the Bank of England argues that while rising equity-market capitalization might well be associated with financial development and economic growth, there is no such relationship between market turnover and growth.
沃克尔法则（是以前美联储主席保罗•沃克尔命名的）持类似的观点。批评人士抱怨道，这将减少重要市场的流动性，比如说非美国主权债务的市场。为辩护其法则，沃克尔追溯了金融系统较简单的时期，提到了“流动性过大、投机盛行的证券市场”。他发出的信息很明确：他不担心交易量减少。