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They're a fairly recent development.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2516593/

> In 1961, more than 75% of London’s inner-city population lived within 1 kilometer of a supermarket, giving them easy access to a variety of foods, says principal investigator Jason Gilliland, who directs the university’s Urban Development Program. In 2005, he says, that number was less than 20%.




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