Even then, supermarkets being stocked isn't a self-sustaining vacuum. Not all goods sold are produced within 100 miles. The fields are cleared with industrial e

Even then, supermarkets being stocked isn't a self-sustaining vacuum. Not all goods sold are produced within 100 miles. The fields are cleared with industrial equipment, sourced with semiconductors and parts produced across continents, the grain is processed in a facility, the product is delivered by a driver, and some point later a 99¢ box of pasta is on the shelf. Very few items can carry on forever due to complete sourcing, production and distribution occurring as closed systems. We simply don't have that level of vertical integration.