Bitcoin marketcap is only around 12 billion dollar so if few billionaire try to manipulate the market they can easily substract/add few billions which can swing price to +/- 10% easily within few hour as well as there are several events which can easily cause panic dump/pump, one of the latest example is yesterday's hoax about china limiting bitcoin trade cause price to drop from $740 to $685 within few hour.
recent events once again confirm the fact that China sets price for Bitcoin. The rest of the people to influence the Bitcoin can not
Do you have any link of news to confirm your statement?
Haven't you heard the recent rumor about the Chinese authorities intending to set up capital flow barriers? They haven't yet done anything, and most likely ain't going to, but the price has already crashed almost 10% on the rumor alone. Is this not enough to prove who is de facto setting the Bitcoin price? And what would happen if they were going to restrict Bitcoin, and that would be for real? On the other hand, the Bitfinex hack has shown pretty clear how much price depends on the Chinese exchanges...
And Bitfinex is only a small fish among these exchanges