Sales volume, scope of operation and wide customer base: Walmart has been able to capture a huge market share by selling almost everything and being almost everywhere. It has endeavored to meet the demand of various segments of the market, and to present a huge swath of buying opportunities, compressed into single locations. It actually has a multiple-store format that extends its market reach, and it sells goods through four types of stores: discount stores, Walmart Supercenters, Sam's Club warehouses (which sell bulk items), and neighborhood markets.