"Which one is correct" is a philosophically hilarious notion! but, the prices are different primarily because of cost (in terms of fees for wire transfers and

"Which one is correct" is a philosophically hilarious notion! but, the prices are different primarily because of cost (in terms of fees for wire transfers and third parties) of getting money in and out of the exchange, ease of doing so (gox is pretty cheap but is taking like 30+ days to get paid), and just access (much harder for chinese to be on gox than btcchina and china also has strict capital control laws that bitcoin seems to be an easy loophole around). Similar to why cocaine is cheaper in colombia (or miami) than NYC or bumfuck kentucky.