The price is quite stable in 2016 apart from one 20% drop due to Mike Hearn's departure from bitcoin.
The bitcoin price has been below $400 for a few weeks now. Why it is so low at the moment?
Low? It was ranging between $200 and $300 for most of 2015. As to why,
Hearn's very public departure was a few weeks ago.Edit: and it's Chinese New Year right now, which is the largest internal migration on the planet - many BTC traders have spent the last few weeks travelling to, or hosting, family.