Their monopoly is more abstract: they have a monopoly on convenience. They ensured their product selection covers a wide variety of common objects that most peo

Their monopoly is more abstract: they have a monopoly on convenience. They ensured their product selection covers a wide variety of common objects that most people end up buying and streamlined their checkout process (they had the patent for 1 click checkout for 20 years) to reduce as much friction as possible to ensure that carts would not be abandoned.