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A woman uses a smartphone outside a store in the Ginza district of Tokyo, Japan, on Tuesday, Sept. 27, 2016. The Japanese currency has gained 19 percent against the U.S. dollar this year, undermining the Bank of Japan's efforts to stoke inflation and economic growth. Photographer: Akio Kon/Bloomberg via Getty Images

A woman uses a smartphone outside a store in the Ginza district of Tokyo, Japan, on Tuesday, Sept. 27, 2016. The Japanese currency has gained 19 percent against the U.S. dollar this year, undermining the Bank of Japan's efforts to stoke inflation and economic growth. Photographer: Akio Kon/Bloomberg via Getty Images