Bets on low market volatility went spectacularly wrong

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THE Cboe Volatility Index, or Vix, known as the “fear gauge”, spikes when markets are most jittery. When Sandy Rattray, now at Man Group, an asset manager, worked on the Vix in the early 2000s, he and his team considered launching an exchange-traded product (ETP) linked to it, but concluded that it would be a “horror show” because of poor returns. Now, however, Vix-linked ETPs are a big industry, with around $8bn in assets. Formerly niche investments, they served vastly to exacerbate this week’s market turmoil, which saw the Vix’s largest ever one-day move, when it more than doubled on February 5th.The Vix was always intended as a basis for financial products as well as a gauge. Vix futures were launched in 2004 and options in 2006. “Long” Vix products, which Mr Rattray looked into, seek t

Central banks should gamble on productivity-improving technology

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IN 1996 Alan Greenspan began asking why the flashy information technology spreading across America seemed not to be lifting productivity. He was not the first to wonder. A decade earlier Robert Solow, a Nobel prizewinner, famously remarked that computers were everywhere but in the statistics. But Mr Greenspan was uniquely positioned, as the chairman of the Federal Reserve, to experiment on the American economy. As the unemployment rate dropped to levels that might normally trigger a phalanx of interest-rate rises, Mr Greenspan’s Fed moved cautiously, betting that efficiencies from new IT would keep price pressures in check. The result was the longest period of rapid growth since the early 1960s. Despite his success, few central bankers seem eager to repeat the experiment and many remain bl

How to interpret a market plunge

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FOR much of the past two years, market watchers have had little to write about, apart from the passing of one stock-index milestone after another. The events of the past week, however, have shaken the financial world awake. A recent, upward zag in bond yields seemed to signal the arrival of a new theme in market movements. Stock prices confirmed it, and then some. Over the past week, American stocks have dropped about 7%, punctuated by a breathtaking, record-setting plunge on Monday. The Dow Jones stock index recorded its largest ever one-day drop, of more than 1,000 points. In percentage terms the decline, of more than 4%, was the biggest since 2011.The swoon set tongues to wagging, about its cause and likely effect. There can be no knowing about the former. Markets may have worried that ...