Bitcoin is a digital currency of great value. Bitcoin value is always changing rapidly. Factors affecting bitcoin trading.
1. Supply and demand.
2. Communication.
3. Political change.
4. Changes in government regulations.
5. Changes in the rules of bitcoin.
I believe the only factors that's influencing Bitcoin business are just the stated point in the 1-3, 3 and 4 are actually the same thing while the change in the rules of Bitcoin (which I believe is Bitcoin protocol) is decided by the community and could only yield positive influence on the Bitcoin businesses.