(Offer and Acceptance. An "offer" is an expression of willingness to do or refrain from doing a particular thing.Study with Quizlet and memorize flashcards containing terms like Contract, A contract must be the following:, express contract and more. Common Law Remedies: Today's breach of contract principles arose out of common law, the judicial system the US inherited from the British. Legal competent parties (all parties must be legal of age).