Better retail website, ebay or amazon?   stance: ebay is the retail website for me:
Although eBay serves only as a market medium for connecting suppliers with consumers I would say eBay is better from an economic perspective. With no firmly set prices, eBay's market closely resembles an internet-based free market... where consumers pay the prices they are willing to pay and suppliers supply goods for what they are willing to supply them for. In otherwords this is a self-targetting market which operates (with the exception of delivery problems) at optimum efficiency.
Amazon on the other hand used to use consumer price-targetting, in other words they would raise prices on certain books for certain users they found to be more likely to purchase certain kinds of books. It was only after they were caught that they decided to stop the price targetting. Now they are setting prices based on what the product suppliers are setting them at, they may not be working at optimum efficiency.