Bitfinex is leading the volumes and the price. If bitfinex price goes under 500 bitstamp & other will follow
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Huobi has more volume than Bitfinex though. It's China that leads other exchanges mostly.
Not really, huobi and okcoin have mostly fake volumes. Biggest platform are bitstamp&bitfinex then btcchina. Not saying that huobi and okcoin has to be ignored (we are adding them very soon ) but their volumes has to be taken as half fake.