Last night, my second girl and 12 yo daughter Bien Mary, who just finished Grade 7, going to Grade 8 this coming school year, asked me, "Dad, what happens if there is no money in the world?" I briefly answered it with "then people will go for barter, like several centuries ago." She followed it up with "And what happens if there is no politics, no government?" Hehe, my second girl has some DNA of me -- non fan of more politics, more government. My first daughter too, Elle Marie, told me she finds her subject in Grade 11 "Politics and Government" confusing and non-interesting.
Anyway, I checked Adam Smith's "The Wealth of Nations" (1776), Book 1 Chapter 4 is "Of the origin and use of money." See some origins or pre-money, pre-coins, form of exchange: use of cattle, salt, shells, tobacco, sugar, etc. Then people realize the inconvenience of carrying and exchanging different commodities. So they later use metals as form of exchange.