The general rules relating to the limitation of actions in negligence actions for economic loss
35 A plaintiff cannot sue for damages in negligence until the cause of action accrues. But once it accrues, time commences to run. In Commonwealth v Cornwell (2007) 234 ALR 148, Gleeson CJ, Gummow, Kirby, Hayne, Heydon and Crennan JJ said (at 150, [5] to [6]):
"[T]o show the existence of a completely constituted cause of action in negligence, a plaintiff must be able to show duty, breach, and damage caused by the breach; accordingly, in the ordinary case, it is at the time when that damage is sustained that the cause of action 'first accrues' for the purposes of a provision such as s 11 of the Limitation Act 1985 (ACT) [the equivalent of s 14 of the Limitation Act 1969 (NSW)].
In Hawkins v Clayton [(1988) 164 CLR 539], which turned upon a provision of the New South Wales legislation [s 14 of the Limitation Act 1969 (NSW)] relevantly indistinguishable from the territory legislation, this court refused to place a particular gloss upon the statutory text. The court rejected the proposition that, at least in the case of claims in negligence for economic loss, time does not run until the plaintiff discovers, or could on reasonable inquiry have discovered, that damage has been sustained."
36 These remarks confirm, authoritatively, that, for the purposes of calculating limitation periods under the Limitation Act in the case of claims in negligence for economic loss, time may run (absent a special statutory provision) before the plaintiff discovers, or could on reasonable inquiry have discovered, that damage has been sustained.
37 Thus, in the present case, time ran even during the period when Mr Christie was ignorant of the fact that he was suffering or could suffer loss.
38 In Cartledge v E Jopling & Sons Limited [1963] AC 758, the House of Lords held that the plaintiffs' cause of action arising out of negligent exposure to noxious dust over a period of years resulting in a lung disease arose as soon as the breach of duty by the defendant caused personal injuries to the plaintiffs beyond what could be regarded as negligible (even if that injury was unknown to, and could not be discovered by, the sufferer). Any further damage occurring after the date the cause of action originally accrued was part of the same cause of action.
39 In Commonwealth v Cornwell, Callinan J (at 162, [57] to [58]) pointed out that some contingencies take a lifetime to play out, but courts do not wait a lifetime. They assess damages once and for all on the basis of the probabilities as to which cogent evidence is called (see also Darley Main Colliery Company v Mitchell (1886) 11 App Cas 127). His Honour was in dissent in Cornwell in that he regarded the contingencies that the majority held had prevented the appellant's cause of action accruing as being capable of resolution, and in his Honour's view the appellant's loss was ascertainable. Nevertheless, nothing said by the majority is inconsistent with the well-established general principles Callinan J expressed in the passages cited.
40 The general rule can be stated as follows. For economic loss (as with other forms of damage) to be sustained, there has to be some actual, measurable damage that is beyond what can be regarded as negligible. While prospective loss, alone, is not enough, a cause of action of negligence will accrue when the plaintiff first suffers any actual damage of the kind described. The cause of action will then be regarded as having accrued, even if some of the plaintiff's damages are prospective. The plaintiff may then claim for the actual damages that have been incurred and should quantify and claim for the prospective damages (such as, for example, future loss of profits). This, for example, is what occurred in Perre v Apand Pty Limited (1999) 198 CLR 180. These propositions are well-established and are manifest from Commonwealth v Cornwell (at 152 to 153, [16] to [18]), Wardley Australia Limited v Western Australia (1992) 175 CLR 514 (at 530 to 531), Hawkins v Clayton (1988) 164 CLR 539 (at 561 and 588), Winnote Pty Ltd v Page [2006] NSWCA 287 (at [40] to [41]), Cheney & Wilson v Duncan (2001) 34 MVR 28 (at 32, [24] to [26]), Scarcella v Lettice (2000) 51 NSWLR 302 (at 306), Law Society v Sephton & Co (a firm) [2006] 2 WLR 1091 (at 1108, [60]), Cartledge v E Jopling & Sons Ltd (at 772).
41 The principles applicable when the claim is for damages for misleading or deceptive conduct under the Fair Trading Act (or the Trade Practices Act 1974 (Cth)) are the same. In Wardley, the High Court, after recognising and discussing the differences between common law damages for negligence and damages under s 82 of the Trade Practices Act, accepted that the general principles governing when time begins to run do not differ in respect of those causes of action. Senior counsel for Mr Christie did not suggest otherwise.