I thought the big idea behind Amazon’s marketplace was to encourage product purchases so sellers make money from sales and Amazon makes money from referral fees (and a ton of other fees). I thought another big idea was consumer first
eBay vs Amazon as a Seller
There was an interesting post in an Amazon forum about whether eBay or Amazon is better for sellers and their opinion was eBay is the Gold Standard and Amazon is the Black Standard. eBay is far from perfect and I