You can't withdraw USD from Mt. Gox, so people buy bitcoin to withdraw, driving the price up. Incidentally the same site did an analysis on that a few months ag

You can't withdraw USD from Mt. Gox, so people buy bitcoin to withdraw, driving the price up. Incidentally the same site did an analysis on that a few months ago as well: http://thegenesisblock.com/bitcoin-cross-exchange-spreads-reach-16-month-high/ http://thegenesisblock.com/bitcoin-cross-exchange-spreads-re...