In a letter to shareholders, Amazon outlines the four principles that guide the company: customer obsession rather than competitor focus, passion for invention, commitment to operational excellence and long-term thinking. In both their online and physical locations, the focus is on selection, price and convenience. One key differentiator? They don’t stress about competitors as much as they are hyper-focused on their customers.Last year, Amazon’s retail strategy was dominated by its acquisition of Whole Foods and a nationwide search for a second headquarters — all while continuing to focus on increasing its customer base with both online and offline shopping experiences. Here’s an overview of Amazon’s strategy in 2019, and what retailers can learn.