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Food deserts are not an inevitable consequence of poverty or low population density, and they didn’t materialize around the country for no reason. Something happened. That something was a specific federal policy change in the 1980s. It was supposed to reward the biggest retail chains for their efficiency. Instead, it devastated poor and rural communities by pushing out grocery stores and inflating the cost of food. Food deserts will not go away until that mistake is reversed.

Congress responded in 1936 by passing the Robinson-Patman Act. The law essentially bans price discrimination, making it illegal for suppliers to offer preferential deals and for retailers to demand them. It does, however, allow businesses to pass along legitimate savings. If it truly costs less to sell a product by the truckload rather than by the case, for example, then suppliers can adjust their prices accordingly—just so long as every retailer who buys by the truckload gets the same discount. […] The Robinson-Patman Act, in short, appears to have worked as intended throughout the mid-20th century.

Then it was abandoned. In the 1980s, convinced that tough antitrust enforcement was holding back American business, the Reagan administration set about dismantling it. The Robinson-Patman Act remained on the books, but the new regime saw it as an economically illiterate handout to inefficient small businesses. And so the government simply stopped enforcing it.