> Beyond Amazon specifically, the big picture trend is that any marketplace of 3rd-party sellers which includes eBay, PayPal, Uber, Airbnb, etc will always tilt

> Beyond Amazon specifically, the big picture trend is that any marketplace of 3rd-party sellers which includes eBay, PayPal, Uber, Airbnb, etc will always tilt the advantage towards the buyers. eBay found out very early on that having a great marketplace for sellers is worthless without having a compelling buying experience. What good is a flea market if no customers come by, or your reputation is so bad that buyers avoid you?