"Dunbar's Number" refers
to the maximum number of people that a single person can truly know (and thus trust and cooperate with).
By assigning abstract meaning to things, humans were able to overcome Dunbar's number to cooperate
at scale.
Unfortunately, humans can't scale cooperation 100% because of "competing" abstractions.
Enter Bitcoin, a zero-trust version of the sapien-invented cooperation abstraction we colloquially refer to as "money."