World's Biggest Market Shrinks at Least 20% as Profits Slide

  • Currency trading falls in U.K., North American markets
  • Figures shown in central banks' snapshot survey for October

The New York Stock Exchange (NYSE) stands in New York, U.S., on Friday, Jan. 8, 2016. The Standard & Poor's 500 Index fluctuated near a three-month low as energy shares followed a retreat in crude, overshadowing early optimism on China's moves to restore calm to its sinking markets and data that showed U.S. payrolls surged more than expected in December.

Photographer: Michael Nagle/Bloomberg
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The world’s biggest financial market just got a whole lot smaller.

Currency trading in the U.K. and North America shrank by more than 20 percent in October from a year earlier, according to central banks in those regions.