Oh wait! I was answering about fundamental scarcities. You mean a holding's or followers' wants?
For a holding, at the beginning of every session the hardholder makes a Wealth move. It determines whether, as the session opens, the holding has its surpluses, its wants, or its surpluses and one of its wants.
For instance, in my hardholder Barbecue's holding, at the beginning of every session I roll to find out whether I have 2-barter, 2-barter plus either anxiety or idleness, or no barter but both anxiety and idleness.
The hocus has a similar move. I think that the equivalent to wants for a chopper's gang is called vulnerability, and the equivalent to wants for an operator's gigs is called disaster.