What must exist for a contract to be enforceable regarding the subject matter?

For a contract to be enforceable, it is essential that the subject matter of the contract is legal. This means that the agreement must pertain to activities or exchanges that are permitted by law; otherwise, the contract would be deemed void and unenforceable. Contracts involving illegal activities, such as the sale of illegal substances or auctions of stolen property, cannot be legally upheld in a court of law because they contravene public policy and statutory regulations.

While contractual clarity, written documentation, and mutual consent are important elements for a contract's validity and enforceability, they do not supersede the requirement for the subject matter to be legal. A contract may be clearly outlined and mutually agreed upon, but if its subject matter involves illegal acts, the law will not enforce it. Therefore, having legal subject matter is a fundamental requirement without which a contract cannot be recognized as valid in legal terms.