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Re:Show HN: I built a live Bitcoin price aggregator with mul... by brown on Monday December 02, 2013 @12:49PM (#6835193)
That's a classic arbitrage strategy. It works. The only reason that traditional "big" finance isn't doing it yet is that Bitcoin is too small/new.

As for risks:

http://en.wikipedia.org/wiki/Arbitrage#Risks

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