many bitcoin price manipulation was a pretty big play.
therefore making huge profits but there are still problems as members of this makes bitcoin bitcoin prices do not ever fall from the previous lowest price.
i think it was possible in past but now as time pass and bitcoin is becoming more and more popular and the number of bitcoin users are increasing continously therefor it is now becoming difficult to manipulate the price of bitcoin.
I think even now we can manipulate the bitcoin price. It can be manipulatedin the way of if the demand of bitcoin is increasing then, same goes for the value of bitcoin it will increase also. However, it will happen only if the users of bitcoin will increase and use it for their daily transactions. Plenitude support of people has a big impact on the manipulation of bitcoin price.