Bob contracts with Ace Plumbing, Inc., to pay $700 over a six-month period for its services. After Ace performs, they sign an accord, in which Bob promises to pay Ace $500 next week in lieu of the $700. Bob does not pay the $500. Ace can bring an action against Bob based on________.
Bob and Ace plumbing have made a contract and even signed an accord, hence either the accord or the original contract can be used by Ace to bring an action against Bob.