Does An Exclusive-Dealing Agreement Violate The Antitrust Laws?

Sometimes parties will enter a contract whereby one agrees to buy (or supply) all of its needs (or product) to the other. For example, a supplier and retailer might agree that only the supplier's product will be sold in the retailer's stores. This usually isn't free as the supplier will offer something-better services, better prices, etc.-to obtain the exclusivity.

If you compete with the party that receives the benefit of the exclusive deal, this sort of contract may aggravate you. After all, you have a great product, you offer a competitive price, and you know that your service is better. Then why is the retailer only buying from your competitor? Shouldn't you deserve at least a chance? Isn't that what the antitrust and competition laws are for?