Along with the USD and JPY, Bitcoin is having a bad day. For the second time, following a 'touch' of the Gold, Bitcoin has fallen dramatically in the days after. Volume is also relatively heavy. It would seem that this drop in USD BTC has compressed the "arb" against China BTC to zero (from over $100 earlier in the week). USD BTC $940, China BTC 5771 (USD equiv. $946)
[4]
Chart: Bitcoinwisdom