Difference in price of BTCUSD between popular marketplaces

[Fredon]

Hi,

I try to figure out what is driving Bitcoin price and especially why is there such difference between hitBtc and others marketplaces.

As you can see in the link bellow price is 6.8% higher at hitBtc compare to the rest of popular marketplaces and I can't believe better liquidity, services or stronger security is the root cause.

Could somebody give me some hint please ? 

http://bitcoincharts.com/markets/currency/USD.html

[Scamc0p]

I have seen major differences from btc-e and preev prices as there is a difference in 15 minutes between the price flux.