Trade, not as complicated as it sounds
The idea is to have Bethshean as self sufficient as possible. To be able to acquire the things that the community does not produce for itself. There has to be excess produced, to be traded to outside suppliers, or sold for money.
There are services that can be shared, in fact, due to the small size of the population some services must be shared to stay practical. So, the internal Guidelines have to encourage cooperative purchasing, and use of resources.
But it must be capitalistic because it has to have the incentive to produce efficiently. Financial incentive is a much easier way to encourage production than either ethics, or a sense of fairness. One of the great things about capitalism is that the individual decides how their wealth is spent. Most people don't want to spend their money on overwhelming bureaucracies or wasteful programs.
Bartering should be encouraged when practical for the individuals.
Bethshean does not have large enough population to be able to support a bank on its own. It will have to share one with other communities. The bank will have be able to handle gold and silver deposits.