Bitcoins price is based on supply and demand on the market.More demand higher price more supply down price.Yes you can manipulate bitcoins price if you hold a huge supply or supply that may be enough to sell or buy in the current market status
Completely agree, I'm sure that happens with bitcoin is natural because of demand and supply factors, and not due to the influence of the pump. It's hard to do the pump because the stock and demand bitcoin spread evenly (no one's monopoly).
That's what you think, but I believe there are people who can really make manipulation although not totally but they can make a great impact to the market in their favor. Look what happen to the price, it has fall back hard and I believe whales are one of those who are making it possible to make people panic, but in the end, they are still the one who are victorious as they can buy cheap bitcoins to add their total holdings.