Staples Inc. is the world's largest office superstore, with over $20 billion in annual sales and the largest market share in the office supply chain industry. After implementing its "easy" marketing campaign emphasizing convenience, Staples' earnings per share more than doubled. Its current "That was easy" campaign refers to an "easy button," implying Staples can simplify convoluted situations for customers. While competitors like Office Max, Office Depot, and Wal-Mart hold large market shares, they lack Staples' product differentiation, convenience, and customer focus.