The supply at the time of writing is around 17.2 million Bitcoins (also accounting for lost Bitcoins, or the Bitcoins Satoshi Nakamoto mined before opening the blockchain up to other users). ... In short, as supply falls and demand increases, Bitcoin's price will rise
According to Nexo's researchers and analysts, a massive rise in the Bitcoin price could occur due to the upcoming halving event. A halving event in Bitcoin is when the amount of Bitcoin generated by the network roughly every ten minutes is cut in half. This event takes place about every four years