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Price difference among shares in Hong Kong and Shang Hai
Wikipedia talks about the Chinese currency: Scholarly studies suggest that the yuan is undervalued on the basis of purchasing power parity analysis. so despite it appearing cheaper due to the official exchange rate, the price in China might actually be fair. There are also restrictions on foreign exchange (purportedly "to prevent inflows of hot money"), which, in concert with any other legal obstacles to owning or trading on the Chinese exchange, may also explain why the high-frequency traders aren't tripping over each other to arbitrage away the difference.