Supply and demand
This isn't a factor. It's a law.Still the factor that affect the price of Bitcoin
.I think we can add :
1. Market speculation: The price of Bitcoin fluctuates based on market speculation. Traders speculate the next price of Bitcoin and trade accordingly affecting the price of Bitcoin. Depending on how they view the future market trend, it can make the price rise or fall thus affecting the price of Bitcoin.
2. Economic Condition: The condition of the global economy also affect the Bitcoin price, when there is a downturn, investors may seek Bitcoin as a safe-haven asset thus driving the price up while if economic growth may lead investors to invest somewhere else, driving the price of Bitcoin down.
3. Mining costs and mining difficulty: This dictates how much a miner will price their Bitcoin. In order to compensate for the expenses miners tends to price their mined BTC according to their maintenance cost and difficulty.
4. Security of the network: network security brings confidence to the market if a hack occurs, the trust of investors and traders will be greatly affected making them to move out of the BTC economy thus creating selling pressure that can lead to Bitcoin price plummeting. The more confidence the investors have, the more they are willing to invest and stay in the industry.