I think depending on the strength of our money, if we have stock of the bitcoin dominant than circulating in the market then we easily manipulate the price of the bitcoin.
The people that holds a lot of bitcoin can have the power to manipulate the price of it. And we know on how the whales are manipulating the market and there are pump and dump groups that are helping each other to get some decent profit. There is a way to manipulate bitcoins price but it is not that an easy thing if you only have very few.
Although they have a large capital though. They will not be able to manipulate bitcoin prices because users are already very large. And it would be very difficult for them to make a panic.