Walmart's competitive advantage stems from its early entry into discount retailing, supply chain management, and relationships with vendors. Its large store footprint and geographical reach gave it a first mover advantage in rural areas. Walmart's seamless distribution network and inventory management systems allowed for just-in-time replenishment. It diversified its vendor base so it did not rely too heavily on any one. Marketing focused on consistently low prices. Employee profit sharing and incentives helped satisfaction and retention. This combination of operational effectiveness and strategy makes Walmart's competitive advantage sustainable.