True, but Amazon Prime is a de facto warehouse club (cf. Costco) where you pay $100+/year for the privilege and perks to shop there. Once you're in the Prime ec

True, but Amazon Prime is a de facto warehouse club (cf. Costco) where you pay $100+/year for the privilege and perks to shop there. Once you're in the Prime ecosystem, your switching costs become higher. Within Amazon's ecosystem, you can get a discount by using their credit card, a discount on shipping, a discount on pre-ordering items on a subscription, and all the personally-targeted aspects of a typical loyalty card. This is their moat vs. Walmart, and consequently, Walmart would have to offer a significantly cheaper (or "better") service to entice switchers -- a high bar for luring discretionary customers.