3rd in a series, previous is
here.
kchoze had said the US has 8000-12000 people per supermarket, so I've been using 12,000 to be conservative. But a casual websearch turned up the US having 38,000 "supermarkets", or one per 8400 people. Say 8000. Then a density of 8000 people/km2 is walkable like 12,000, one market per square kilometer. And we
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