First, the reason why the price of bitcoin has grown exponentially in the last couple of weeks because of the looming Segwit2x that is scheduled around Nov. 16. Investors are then buying bitcoins like crazy because they anticipated that with this fork they will get free coins as well. However, yesterday, Segwit2x proponents decided to postponed this activation. Obviously, some are disappointed to this news because they will not get their free coins that's why they quickly cash out and sold of their bitcoin and move their funds to altcoins market. That's why the price of bitcoin has continue to drop because of this reasons.