cryptocurrency prices in this market are usually affected by the very high total supply and demand for bitcoin but for now the market price can also be affected by bad news that makes these traders panic so that it will cause up and down movements in the existing prices in the market.
Supply and demand doesnt control the market. It just affects the market value of a coin. In my opinion the whales controls the market because their investment is so big that the can change the price of any coin according to their well. In my country there are big money exchangers who control the prices of different currencies. They have the keys of currency market.