I believe that bitcoin's price is affected by someone. this person can adjust the price, make it lower and buy as much as possible.
No single individual can wield that much enormous powers as to single handedly affect the price of the bitcoin,its basically impossible,we have heard of a group of individuals(whales),who dominate the market based on their astronomically large asset,but even such assumptions most times is yet to be clarified if it aint actually a myth
From my stay on the forum,ive heard a lot of time that certain factors trigger the price of the bitcoin(a rise or a fall), but I'm not yet privy to such factors