But Chevrolet DOES have an exclusive dealings contract with Chevrolet dealers. If you want to buy a Chevy, you HAVE to go to a Chevy dealer. You can't go to a Pontiac dealer, you can't go to a Ford dealer--you HAVE to go to a Chevy dealer. Moreover, automobile dealerships are given exclusive territories in which ONLY they can sell automobiles.
What you seem to not understand is that you think that exclusive distributorships are illegal, or even wrong. They simply are not.
It depends entirely on what it is. Chevrolet is not the only manufacturer or seller of automobiles. If they were, I would be upset if there were only one place to buy one.
There are a lot of these partnerships and contracts around, but they aren't as prominent as some of these sports deals.