A Louis Vuitton store, operated by LVMH Moet Hennessy Louis Vuitton SA, left, and a Citigroup Inc. Citibank branch stand in the central business district during a No. 8 Storm Signal raised for Typhoon Linfa in Hong Kong, China, on Thursday, July 9, 2015. After tumbling the most since the financial crisis on July 8 amid a record surge in volatility, the Hang Seng Index rebounded Thursday to its biggest gain in three months. Photographer: Jerome Favre/Bloomberg via Getty Images