The price of bitcoin falls due to the fact that many people sell their bitcoins for Fiat and thus the demand falls. But in 2018 there will be a lot of good and positive news at the end of the year, so we are waiting for the market to stabilize.
I hope that the common speculations of the members here in the likes of this comment will come true that bitcoin for this year 2018 will have a good and positive market price increase before the year 2019 enters. I could be able to celebrate for it if it will going to happen since i have my small scale investment here in bitcoin.