except that most resources are also static and that not all land is equal one community nay have a dire need for water but no reasonable access, another neighbouring community may feel that while they have ready access to water that it in only enough to meet the needs of their community and they have no ability to share that does not damage their own community.
How long before conflict over the resource happens even with the best intentions of both communities.
You can replace water with any resource that is useful to the advancement and survival of a community.