According to the case"Angel v. Murray", the modern trend appears to recognize the necessity that courts should enforce agreements modifying contracts when unexpected or unanticipated difficulties arise during the course of the course of the performance of a contract, even though there is no consideration for the modification, as long as the parties agree voluntarily.There are four requirements of Consideration in the modified contract for it to be enforceable: (1) if the parties voluntarily agree.(2) if the promise modifying the original contract was made before the contract was fully performed on either side.(3) the underlying circumstances which prompted the modification were unanticipated by the parties.(4) the modification is fair and equitable.很快就會轉回去天昭了
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