Yes, I can easily imagine a tribesman coveting what his tribemates have. As for how exactly he acquired those things... it probably did not involve "affording" anything, because there was no currency. But I'm sure there were fights, theft, etc as well as plenty of labor invested in manufacturing more trinkets. Necklaces were not simply found on the ground; you would have needed to come up with a needle, thread, possibly a drill... all much harder to procure in the days before Home Depot!