This is a fairly short interview, and it has a relatively concise description how national economies actually operate minus the economic superstitions favored by neo-liberal politicians, neo-classical economism-ists, and the paleo(gold bug) economism-ists.
When you have a grasp of what Steve is saying, then you will also be in reach of an understanding of how a sovereign, fiat currency can support a functional community (remembering that "oikos" the Greek root of the first part of the word "economics" means "community"). From that point it is also a fairly short reach to the details of how a cooperating community could operate a local currency system both to benefit the participating community, as well as the community in which that process is embedded.
One more caveat, the system requires a certain level of expectation of the capacity to operate in a communal or even on a "cooperative" basis. Think of neo-classical economics like a pair shoes that are too tight and that make your feet and the rest of your body feel serious pain. The source of that pain is the belief system that subscribes to the notion that sovereign communities should operate in a manner comparable to separate households. The primary solution is at least to go shopping for another pair of shoes, hopefully without reproducing the pain caused by the much cherished economic superstitions. BTW the bitcoins episode is NOT such a model.