Bartering—the exchange of goods and services without the intermediary of currency—is the oldest form of commerce.  Local economies, using barter or a local currency as a means of exchange, were the norm for most of human history.  The Resilience Circle Network has developed a one-session introduction to organizing a bartering system or time bank.  It’s easy to set up and can be expanded gradually.  You can download a PDF of this unit at:  https://localcircles.org/wp-content/uploads/2009/05/csctimebanking.pdf