Gold is not simply a shiny metal or a collective fiction. I think many historians (e.g. Harari) got this wrong. Humans first learned how to manipulate metal through gold around 40k years ago. It sparked the metal industries that advanced human civilizations. Humans progressed through Bronze Age, Iron Age. Gold was an icon of metal technologies. Its use as money probably predated written history.
https://bitflate.org/post/2019/11/29/how-gold-became-money.h...