Why bitcoin going down?

1. people are investing in bitcoins currently , Investors start investing money in Ripple (1.2$ current) and bitcoin cash (3600$) , Dogecoins (0.008$)

2. some short term investors start selling of their bitcoins to recover the profit. they will buy again when it come low.

3. bitcoin Rise and Drop is a part of game , It will down and Come back again ,

In recent news someone bet that bitcoin price will reach 50,000$ Next year