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Yes, most of big trading houses do arbitrage trade, especially in currency trading.

It could be very profitable way since the trader just look for certained return from price mismatch, which nearly gets the risk out of the game. W. Buffett has done a lot of arbitrage trade for his profit puffs before he just do buying and holding. It could be quite safe and quick way to get the first basket of gold.

I never try arbitrage trade before but believe if you could find the mismatch and the profit is big enough, it is money printing machine.