The European Union flag is seen flying, at the border of Gibraltar with Spain, in the British overseas territory of Gibraltar, historically claimed by Spain, June 27, 2016, after Britain voted to leave the European Union in the EU Brexit referendum. REUTERS/Jon Nazca

A man walks on a bridge in the financial district of Pudong in Shanghai, China June 22, 2016. REUTERS/Aly Song

The logo of Dow Jones Industrial Average stock market index listed company JPMorgan Chase (JPM) is seen in Los Angeles, California, United States, in this October 12, 2010 file photo. REUTERS/Lucy Nicholson/File Photo

A worker arrives at his office in the Canary Wharf business district in London, Britain February 26, 2014. REUTERS/Eddie Keogh/File Photo

An Israeli flag flutters outside the Bank of Israel building in Jerusalem August 7, 2013. REUTERS/Ronen Zvulun/File Photo

The new iPhone 7 smartphone is displayed inside an Apple Inc. store in Los Angeles, California, U.S., September 16, 2016. REUTERS/Lucy Nicholson

File photo shows workers who check a car at Renault's assembly plant in Wuhan, Hubei province, China, February 1, 2016. REUTERS/Darley Shen/File photo

Britain's Prime Minister Theresa May leaves 10 Downing Street in central London, Britain, September 14, 2016. REUTERS/Toby Melville