Sure, the global economy might collapse spectacularly and send us all back to a barter system. But that’s inefficient, Greg Sabin writes on Mental Floss, and “almost all civilizations have come up with currencies.” A sampling of what might be in your wallet next week:
- Shells: "From China to Africa to the Americas," most people used "small, transportable, and rather unremarkable specimens," with value added by "the time and effort spent on tying the shells together to form belts, necklaces, and tapestries."