Wal-Mart is the largest retailer and the largest private employer in the United States. The competitive pressures created by large retailers have long been controversial, and Wal-Mart's growth has raised concerns about its economic impact on workers, communities, and competitors. This paper aims to dispel some of the myths regarding Wal-Mart and to replace them with a systematic accounting of what is known about Wal-Mart's impact on the U.S. and global economy. The paper begins by exploring the source of Wal-Mart's competitive advantage. It then examines some of the economic effects of Wal-Mart: how Wal-Mart stores affect local labor markets, consumer prices, product selection, local and global competitors, and suppliers. I then turn to Wal-Mart's interaction with public policy issues in matters of global trade as well as state and local legislation on wages, benefits, zoning, and subsidies.
We analyze the effect of Wal-Mart's entry into the grocery market using a unique store-level price panel data set. We use OLS and two IV specifications to estimate the effect of Wal-Mart's entry on competitors' prices of 24 grocery items across several categories. Wal-Mart's price advantage over competitors for these products averages approximately 10%. On average, competitors' response to entry by a Wal-Mart Supercenter is a price reduction of 1-1.2%, mostly due to smaller-scale competitors; the response of the "Big Three" supermarket chains (Albertson's, Safeway, and Kroger) is less than half that size. We confirm our results using a falsification exercise, in which we test for Wal-Mart's effect on prices of services that it does not provide, such as movie tickets and dry cleaning services.JEL Codes: L11, L13, L81
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