This document provides an overview of Walmart's history and business model. It discusses how Sam Walton opened the first Walmart store in 1962 in small towns ignored by other retailers. It details Walmart's expansion across the US and pioneering use of technology. The document also examines Walmart's expansion into new retail formats like Sam's Club and entry into international markets. Several questions are posed about the sources of Walmart's competitive advantage, its ability to transfer advantages to new sectors and countries, and sustainability of its advantages against competitors.