>>149327625
They seem to use a mixture of money and barter. Pic related is from "Asterix in Spain". Unhygienix sells his fish, but he's also okay with exchanging them for other goods. "Obelix & co." shows that the village isn't entirely isolated from the rest of the Gaulish community and its economy. Traveling salesmen sometimes visit the village and sell their stuff there. That comic and "Mansions of the Gods" also show that the villagers can get greedy about money if they're sufficiently tempted.