Bioregional
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Bioregional refers to the scale of an economy that is limited to it's local bioregion. The size can vary, but is in general a 60 mile radius - that which can be traveled easily in a single day.
This is an area of 10,000 square miles. Since there are 4 million square miles in the USA, this means there are 400 of such areas in the USA, roughly. Worldwide (57 M sq mi), there are thus about 6000 such areas.