The big influence on why Bitcoin price falls down,are those people who spreading false news is one of the reason why bitcoin price drop,because when they heard about it,especially those people who are new in Bitcoin they will be afraid that they might lose their investment so even if Bitcoin price is cheap they will not hesitate to sell it,and also many big investors who sell their Bitcoin,that's why Bitcoin's supply increases in the market and it's effect is the dump price of Bitcoin.