What would happen if there was only one BTC left in the world?
The total amount of Bitcoin remains unchanged. Bitcoin will be permanently withdrawn from circulation because the holder forgets the private key or dies, so Bitcoin is a deflationary asset. People keep forgetting their Bitcoin private keys, and people keep taking their Bitcoin private keys to their graves. The number of Bitcoins circulating in the market will become less and less, and it is irreversible.
Theoretically, as long as Bitcoin survives long enough, there will be a day in the future when there will be less than 1 Bitcoin left in circulation. Don't worry, this will not affect the function of Bitcoin at all. Because Bitcoin can be divided infinitely. As long as all miners agree, the Bitcoin program can be upgraded to allow Bitcoin to be divided into smaller units. By then, the total amount of Bitcoin owned by people all over the world will be less than 1. And 1 Satoshi is worth a mansion. The money an ordinary person earns in his lifetime is only two or three Satoshi.
Bitcoin will not suddenly be left with only 1, but will go through a long history and be lost bit by bit by people. After someone loses Bitcoin, he or his children will earn Bitcoin from others through labor. The remaining Bitcoins will soon be distributed to everyone again.
The circulation of Bitcoin decreases little by little, and the purchasing power increases little by little. Until millions of years later, humans have become an interstellar civilization. By then, the euro, the US dollar, and the British pound have long become artifacts in museums. On the Orion Arm of the Milky Way, the dotted human colonies still run the Bitcoin network. The buildings of the ancients on Earth have become ruins, but the transaction records of the ancestors of Earth civilization using Bitcoin are still written on the Bitcoin blockchain, unchanged from ancient times!
