TRUE OR FALSE FOR EACH SENTENCE Promissory Estoppel prevents an injustice when one reasonably relies on another's promise and suffers an injury (usually financial loss) as a result. A court may allow a contract to be modified or rescinded if there are unforeseen circumstances. Forbearance, or giving up a legal right, is recognized as a valid consideration. If a buyer promises to purchase whatever the seller produces she has entered into a requirement contract. A covenant not to sue is a contractual provision in which one party promises not to sue the other.