There's no flaw. It's called arbitrage. If enough people do it expect the gap to...

		Aqueous on Dec 2, 2013 \| parent \| context \| favorite \| on: Show HN: I built a live Bitcoin price aggregator w... There's no flaw. It's called arbitrage. If enough people do it expect the gap to narrow, though. It just takes too much time to buy bitcoins with dollars/sell with dollars on some of these exchanges, which is why this is possible.