How Amazon Managed to Dethrone Walmart

Karen Weise��Reporting from Seattle

Back in the 1940s, A&P was doing so well that antitrust authorities pursued the grocery chain.

Then, in 1962, just as Sears overtook A&P, Sam Walton founded Walmart, offering products at low prices. His logistics network operated with such precision and efficiency that it crushed many competitors.

In the early 1990s, Walmart surpassed Sears. And then it kept growing.