While anything involving money has a higher than normal proportion of scammers, it is also true that finance is generally a positive sum activity, that facilitates more productive coordination.
I recommend Nick Szabo's article on the origins of money:
https://fermatslibrary.com/s/shelling-out-the-origins-of-mon...
Szabo hypothesizes that the standardized collectibles seen in various early sites of homo sapien settlement dating from the paleolithic, like the ostrich-eggshell beads from the Kenya Rift Valley dated at 40,000 B.P and the mammoth ivory bead necklace from Sungir, Russai dated to 28,000 B.P, were in fact the earliest forms of money, and that the trade-based trustless coordination that this proto-money enabled raised the carrying capacity of the environment, and enabled humans to out-compete neanderthals.
Intriguingly, Szabo went on to become the first person to describe both the concept of a proof of work blockchain in Bitgold, which inspired Bitcoin, and smart contracts.