Since it was founded in 1962, Wal-Mart has grown to be one of the most powerful corporations operating today. The chain controls approximately 20 percent of the entire American retail business. It has stores in the United States as well as in Mexico and Japan, and also operates in Brazil, Argentina, Canada, and China. Wal-Mart is the largest private employer in the world, and made nearly $380 billion in revenues last year. Driving across the country, it’s hard to miss the Wal-Mart Supercenters in each passing major town, and no matter how many you see, there are always cars in the parking lots.
The map above is from a paper entitled The Diffusion of Wal-Mart and Economies of Density, written by the University of Minnesota professor Thomas J. Holmes, on behalf of the National Bureau of Economic Research. For each year since 1962, Holmes plotted the locations of all…
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