14.01 In all domestic legal systems the modification1 of a concluded contract by agreement is generally possible.2 This naturally follows from the general principle of freedom of contract.3 In general, the rules on contract formation also apply to the agreement modifying the original contract. For common law jurisdictions, save for the USA,4 this in particular means that consideration for the modification must be provided.5 Special regard, however, is to be had to form requirements.6 At the international level uniform law and projects reinforce this position, some...
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