1) eBay and Amazon had contrasting visions in their early years. Amazon sought to replicate an online catalog model by selling products directly to consumers, while eBay recognized the unique ability of the internet to enable direct transactions between individuals through an auction platform.
2) Where Amazon's founder Jeff Bezos envisioned a large dominant retailer, eBay founder Pierre Omidyar envisioned facilitating a marketplace to directly connect many individual buyers and sellers.
3) While Amazon adopted a traditional retailer model, eBay created a unique peer-to-peer marketplace without a direct offline analog, allowing individuals to both buy and sell directly to one another.