This Court's decision in Wardley Australia Ltd v Western Australia established that the term 'by' in s 82 invokes the common law concept of causation. In Wardley, Mason CJ, Dawson and Gaudron JJ and I said:
'The statutory cause of action arises when the plaintiff suffers loss or damage 'by' contravening conduct of another person. 'By' is a curious word to use. ... But the word clearly expresses the notion of causation without defining or elucidating it. In this situation, s 82(1) should be understood as taking up the common law practical or common-sense concept of causation recently discussed by this Court in March v Stramare (E & MH) Pty Ltd, except in so far as that concept is modified or supplemented expressly or impliedly by the provisions of the Act. Had Parliament intended to say something else, it would have been natural and easy to have said so.'
But this does not mean that common law conceptions of causation should be rigidly applied without regard to the terms or objects of the Act. Section 82 now applies to the contravention of any provision of Pt IV, IVB or V, or s 51AC of the Act. In Marks v GIO Australia Holdings Ltd, Hayne and Callinan JJ and I pointed out that the section can apply to many different kinds of cases, not just those where a breach of s 52 is alleged. Moreover, the objects of the Act indicate that a court should strive to apply s 82 in a way that promotes competition and fair trading and protects consumers. The width of the potential application of s 82 and the objects of the Act tell against a narrow, inflexible construction of the section. No doubt in most cases, applying common law conceptions of causation will be sufficient to answer the issues posed by s 82 in its application to contraventions of the Act. But care must be taken to avoid a mechanical application of those conceptions to issues arising under the section. In Elna Australia Pty Ltd v International Computers (Aust) Pty Ltd [No 2] , Gummow J pointed out:
'[I]t would be an error to translate automatically to the particular statute what appeared the closest analogue from the common law `rules' as to causation. It is rather a question of statutory construction.
...
Thus, in construing s 82 it is appropriate to bear in mind such matters as the scope and purpose of Pts IV and V ... [and] the wide range of subject matters dealt with in Pts IV and V but all linked to s 82 ...'