Visitors stand on the roof of a skyscraper as the moon rises over the skyline of Lujiazui financial district of Pudong in Shanghai August 16, 2013. [Photo/Agencies]

An investor looks at an electronic board showing stock information at a brokerage house in Shenyang, Liaoning province August 16, 2013. Major brokerage Everbright Securities Co Ltd said in a filing to the Shanghai Stock Exchange that its trading system encountered problems Friday morning, following a dramatic 5 percent spike in domestic stock indexes that many suspected was the byproduct of a trading error. [Photo/Agencies]