A party's genuine belief that it is not acting in breach of contract does not preclude a finding of economic duress where the conduct is objectively unlawful; the question is whether illegitimate pressure was applied and induced the impugned transaction, not whether the party knew its conduct was unlawful. A 'reasonable endeavours' obligation to supply is an objective obligation informed by capability and capacity, not the supplier's commercial preference. Rescission of a voidable contract procured by duress is required before a restitutionary claim can be maintained. The majority held that broadly worded contractual limitation clauses using 'in respect of' language can extend to restitutionary claims arising from duress connected with the contractual breach, though this was disputed by Murphy JA.
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