A quote from the Freakonomics podcast “How the Supermarket Helped America Win the Cold War”:

[Peter Timmer]: I used to ask my class, I’m talking 1985, “Where is the world’s largest supercomputer?” And the correct answer was, “It’s at the Pentagon.” Okay. “Where is the world’s second largest supercomputer?” Bentonville, Ark. Home of Walmart. They used that computer to track every single item on every single Walmart shelf. That information technology is what revolutionized food marketing. And it was pretty much invented by Walmart.

The episode is terrific if you are interested in the history of food production, the creation of supermarkets and the use of science and technology to create an abundance of food.