You put claims in, you can just pull a guy back if you don't like what the team is offering and you can only trade with that team. That's why a lot of trades don't happen then. You can't create a market since you can only trade with the team who claimed him and a lot of times a claim is made to prevent a competing team from making a claim. Just like with Hoffman last year. The Giants claimed him, but they didn't need him. They just wanted to prevent the Rockies, Dodgers and Phillies from claiming him.