Stocks rocketed higher on Wednesday as investors waited to see whether the market could snap a six-day losing streak that shaved almost 2,000 points off the Dow Jones industrial average. The Dow gained as much as 433 points before retreating. A half-hour into trading, the Dow was up 300 points, or 1.9 percent, at 15,966. As investors just saw, though, those gains don't always last: On Tuesday, the average spiked more than 400 points at the open but closed down more than 200.


For a third straight day, the New York Stock Exchange invoked a little-known rule designed to ease market volatility. Before Monday, that rule had not been used since the 2008 financial crisis. Stocks closed lower by 1.3 percent overnight in China, even after the central bank there cut interest rates to help the economy. Investor worries about China, a major driver of global economic growth, have driven the furious sell-off in world markets. In Europe, stocks were slightly higher on Wednesday. The Dow lost about 1,900 points from Aug. 17 to Tuesday, and it's down about 14 percent from its all-time high in May — well into what is known as a correction.


http://www.nbcnews.com/business/markets/stock-market-turmoil-dow-futures-suggest-big-gain-will-it-n416191

It must last