"[61] An entirely different question is whether an obligation of good faith is by law implied into the parties' contract. The High Court has recently re-affirmed that certain contractual terms are to be regarded as implied by law. In Peters (WA) Ltd v Petersville Ltd [2001] HCA 45; (2001) 75 ALJR 1385, a case concerning licensing of a brand name with associated restraint of trade, Gleeson CJ, Gummow, Kirby and Hayne JJ said:
'The law already implies an obligation by the respondents to do all such things as are necessary on their part to enable Peters WA to have the benefit of those licence arrangements. [Butt v McDonald (1896) 7 QLJ 68 at 70-71; Secured Income Real Estate (Australia) Ltd v St Martins Investments Pty Ltd [1979] HCA 51; (1979) 144 CLR 596 at 607-608]. It is not now necessary to consider the basis of the implication. The law also implies a negative covenant not to hinder or prevent the fulfilment of the purpose of the express promises made in Art 5. [Shepherd v Felt and Textiles of Australia Ltd [1931] HCA 21; (1931) 45 CLR 359 at 378].'
[62] An additional term implied by law into commercial contracts is a term requiring the exercise of good faith in the performance of the contract. This is now in this State a legal incident of every such contract: Burger King Corp v Hungry Jack's Pty Ltd [2001] NSWCA 187. It takes its place beside the terms referred to in Peters (WA) Ltd.
[63] But what are the content and effect of such an implied term? This question was the subject of discussion by the Court of Appeal in Burger King. Sheller, Beazley and Stein JJA referred to the observation of Sir Anthony Mason in his 1993 Cambridge Lecture (see now (2000) 116 LQR 66 at 69) that the concept 'embraced no less than three related notions', being:
'(1) an obligation on the parties to co-operate in achieving the contractual objects (loyalty to the promise itself);
(2) compliance with honest standards of conduct; and
(3) compliance with standards of conduct which are reasonable having regard to the interests of the parties.'
[64] There is some overlap here with the terms implied by law as referred to in Peters (WA) Ltd. Sir Anthony's duty of 'loyalty to the promise itself' may well include the duties not to hinder fulfilment of the promise's purpose and to do everything necessary to enable the other party to have the benefit of the promise. The more substantial and separate content of the duty of good faith itself would therefore seem to lie in the second and third limbs of Sir Anthony's formulation - that is, adherence to standards of conduct which are honest, as well as being reasonable having regard to the parties' interests.
[65] If adherence to such standards of conduct is the predominant component of a separate obligation of good faith in performance of a contract, it becomes necessary to enquire about the extent to which selflessness is required. It must be accepted that the party subject to the obligation is not required to subordinate the party's own interests, so long as pursuit of those interests does not entail unreasonable interference with the enjoyment of a benefit conferred by the express contractual terms so that the enjoyment becomes (or could become), in words used by McHugh and Gummow JJ in Byrne v Australian Airlines Ltd [1995] HCA 24; (1995) 185 CLR 410, 'nugatory, worthless or, perhaps, seriously undermined'. This seems to me to be the principle emerging from para172 to para177 of the joint judgment in Burger King where the various authorities are collected and discussed.
[66] Dr Elisabeth Peden of the University of Sydney has characterised the effect of the good faith requirement in contractual performance as follows ('Incorporation of Terms of Good Faith in Contract Law in Australia'[2001] SydLawRw 9; , (2001) 23 Syd L Rev 222):
'Most basically, by using the obligation to perform in good faith as a principle of construction the courts are merely required to ensure that the parties have genuinely adhered to the bargain which they entered into. This will require an examination of the whole contract and the underlying intentions. Strict rights may not be adhered to, if in the context of the contract as a whole, this would subvert the character of the contract. Most cases that discuss the concept do so in terms of negatives, that is, what is not in breach of good faith. This makes sense, since it is the context of the contract read as a whole that will indicate what is appropriate and what is not.'
[67] Viewed in this way, the implied obligation of good faith underwrites the spirit of the contract and supports the integrity of its character. A party is precluded from cynical resort to the black letter. But no party is fixed with the duty to subordinate self-interest entirely which is the lot of the fiduciary: Burger King at para187. The duty is not a duty to prefer the interests of the other contracting party. It is, rather, a duty to recognise and to have due regard to the legitimate interests of both the parties in the enjoyment of the fruits of the contract as delineated by its terms."