The number's not arbitrary. it's the mathematical result of Bitcoin's emission schedule. he picked round numbers for block times, block halvings, and satoshi divisibility. 10 minute block times, 4-year block halvings, 8 decimals of divisibility. Do the math and that means the halvings occur every 210,000 blocks, and can only happen so many times before we're halving "down from" 1 satoshi. At that point, since partial satoshis don't exist on the blockchain, it just stops the block reward altogether. therefore 21 million is a result of choosing certain values for block times, block halvings, and satoshi divisibility, and those values happened to be rather easily understandable, round numbers.
can you share where you got that information, I want to see it, I think it's not a coincidence or just random, there must be something and you explain it.
I guess he factored in the world's population. He believed 21 millions is enough for billions?
The idea is to encourage scarcity and deflation. The creators of Bitcoin understood what sound money should be. They imitated gold scarcity I guess. It needs to be both Medium of exchange and Store of Value.
Sound money also has to be long-lasting, valuable, scarce, deflationary, divisible, hard to counterfeit, etc
maybe because of the small amount it could be worth millions of $ bitcoin in the future, say 10-40 years into the future.