Something promised, given, or done that has the effect of making an agreement a legally enforceable contract.

对价，承诺被允诺、提供或做成的事物，它能使一项协议成为具有法律效力的契约。

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Part of the problem, he argued, was that some economic transactions are so complicated, and involve so many things which could go wrong, that writing a legally enforceable contract that takes all possibilities into account is impossible.

ECONOMIST: The Nobel prize for economics

Economic growth is often associated with clear and enforceable property and contract rules.

FORBES: A Eulogy For PIPA After Its Violent Death In Washington

Washington is hardly unique in wanting a liberal world system of open trade, freedom of the seas, enforceable rules of contract and protection for foreign investment.

WSJ: Walter Russell Mead: The Myth of America's Decline