Based on your own personal experiences and$/$or knowledge of Amazon.com $($you can reference Illustration Capsule $1\mathrm{.}1),$ do you believe its strategy sets it apart from rivals? Does the strategy seem to be keyed to a cost$-$based advantage, differentiating features, serving the unique needs of a niche, or some combination of these? What is it about Amazon's strategy that can lead to a sustainable competitive advantage? Use text information and outside sources to support your thoughts. Be thorough, and cite your source$($s$).$