We’re talking about new cars though. There are laws in some states (see everywhere Tesla doesn’t have stores) requiring dealers to be used instead of going direct to manufacturers.

> There is no monopoly or requirement to sell a car through a dealer.

This is false. In most states, direct sales are illegal.

Actually dealers have monopoly protected by law in most states.

Monopoly as in there is only one dealer?

> monopoly: the exclusive possession or control of the supply of or trade in a commodity or service.

Dealers have a legislatively enforced [1] monopoly on new car sales.

1. https://en.wikipedia.org/wiki/Car_dealerships_in_the_United_...

> There is no monopoly or requirement to sell a car through a dealer.

This is incorrect. It's required, by law, in most states:

> In the United States, direct manufacturer auto sales are prohibited in almost every state by franchise laws requiring that new cars be sold only by dealers.

1. https://en.wikipedia.org/wiki/Car_dealerships_in_the_United_...

In WA if you trade in to a dealer you pay tax on cars difference. When you sell privately, buyer pays full 10% tax on used car.