If one thing if you are haggling over a used toaster at a yard sale. It's another when you are negotiating a business relationship where the success of both parties is important. A contract with a supplier doesn't do you any good if the terms are so bad it cripples their ability to execute.

That highlights a beef I have with economics. Failure to understand that business relationships are exactly that. You can't model them using the sorts of time invariant non-network models they use.