Where a contractual termination clause already contains safeguards (such as requiring a 'serious or persistent' breach and reasonable time to remedy), there may be no room for a further implication of good faith or reasonableness. The content of any implied obligation of good faith varies according to the terms and context of the contract, and 'good faith' is better understood as a normative standard shaping particular duties rather than a standalone contractual obligation. If any implication of reasonableness is made into a termination clause, it may be limited to requiring that the power be exercised bona fide for the purpose for which it was conferred.
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