In most cases, parties to a contract can agree that rights under the contract cannot be assigned. There is an exception, though, if the right is the right to receive money, which is always assignable....

In most cases, parties to a contract can agree that rights under the contract cannot be assigned. There is an exception, though, if the right is the right to receive money, which is always assignable. Why do you think this exception exists? What impact does it have on the ability to conduct commerce? Would commerce be impaired without this exception? Why? (50 to 100 words)