Amazon's choice to focus on books initially was a calculated strategy informed by a thorough assessment of market dynamics and product features. Books are straightforward to ship, don’t require fitting like apparel or footwear, and possess a distinct universal appeal. At the time of Amazon's launch, there were over 3 million books published globally, far exceeding what any physical store could offer. This enabled Amazon, as an online bookstore, to provide an unmatched variety, giving it a competitive edge. Additionally, books represented a relatively low-risk entry point for consumers who were largely unfamiliar with online shopping. As people grew comfortable purchasing books online, it naturally paved the way for expanding into other product categories, which is evident in today's Amazon.