A Common Good Community is a group of Members and Member Organizations in a particular geographic region, defined (by the Members there) by a set of zip codes. The purpose of the Common Good system is to create and fund community-centered participatory democracy. In a Common Good Community you decide together how much Common Good credit to issue (within safe limits) and what to fund with it.
A Common Good Community is in "good standing" when it is managing its local economy responsibly, so, in particular, the amount of credit issued accurately represents the potential of the community's members to produce corresponding goods and services in the short term. A Common Good Community may lose its good standing if it runs a trade deficit with other Common Good Communities and fails to redeem it in a timely manner. Common Good staff and other Common Good Communities will provide ongoing feedback, to prevent this from happening accidentally.
* There are no specific requirements for a group of members to become a sovereign Common Good Community. But these Clearness Questions will help you get ready for that responsibility.