There were once economies of scale of a sort for things we need for self sufficiency. as we gradually became dependent on the state (domesticated) the skills and services that made it possible to raise a barn or build a coop clear the creek or blow up the freaking beaver dam again, have atrophied and been lost.
We only rebuild this capacity in our communities by starting to do the little things again. Then as a group we will find the local economies that make sense and at what scale.