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The Chinese Market Crash in context. How big is the market, how many investors does it have and does it tell us anything about the wider Chinese economy? Sprinters legs It may seem strange, but world class runners don’t move their legs faster than average park runner. That’s the claim anyway – is it true and if so what is it that makes athletes like Usain Bolt and Justin Gatlin run so fast? (Image: An investory looks at a stock information board. Credit: Reuters.)