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Chinese Bitcoin exchanges don't take a fee per trade and some actually reduce the withdrawal fee if more trades were made.
Outside of China, exchanges usually take a fee on each trade. The volumes therefore are not really comparable, and I sincerely doubt that the actual economic activity is so much bigger in China.
2What statistic is that chart supposed to be measuring? Volume, holdings, something else? – Nate Eldredge – 2017-01-15T04:58:08.047