The cases show that in order that an employer should become liable actually to pay compensation in respect of a particular period there must be (1) an injury of the worker as defined in the Act; (2) a resulting incapacity for doing the work for which he was earning wages; (3) a consequent economic loss of wages. If in fact he is still receiving those wages in respect of a particular period he fails to establish the third element and the employer is not liable in respect of that period - though he would become liable if, the incapacity continuing, he ceased to pay the wages.
However, in my opinion the argument attempts to obtain from the judgment of Latham C.J. more than his words will support. It has always been recognized that "incapacity for work", those words being taken to refer to physical incapacity, is only relevant where it produces an economic incapacity. In Thompson's Case, Latham C.J. said [3] :
The case for the employer was argued upon the basis that when full wages were paid there was no incapacity within the meaning of the Act because the fact that the worker was paid full wages showed that his economic capacity was unimpaired whatever might be the case with respect to his physical capacity. The strange result of the adoption of this argument in the present case would be that the worker was incapacitated for work within the meaning of s. 9 of the Act on 18th and 19th December, but that he became capable for work during the succeeding period of about two weeks, even though he might not have been able to get out of his bed. In my opinion this argument does not give proper effect to the words of s. 9. The phrase "where total or partial incapacity for work results from the injury" must refer to physical injury resulting in physical incapacity for actually doing work. That incapacity is relevant where it produces an incapacity to earn his living as he did before the injury (per Evershed L.J. in Ruocco v. Surrey County Council [4] ) in a market for his labour which was reasonably accessible to him (Birch Brothers Ltd. v. Brown [5] ). Otherwise it is irrelevant for the purposes of the Act. It is in this sense that "incapacity" in s. 9 can be said to mean incapacity to earn wages.
The fact that incapacity for work (regarded as physical incapacity) is only relevant where it produces an incapacity to earn a living has led at times to the formulation that the words actually mean incapacity to earn a living. See, for example, the judgment of Williams J. in Thompson's Case [6] , and the cases which are there cited. But even that formulation either expressly or impliedly supposes physical inability to earn a living.
1. (1950) 81 C.L.R. 585, at p. 598.
2. (1950) 81 C.L.R., at p. 595.
3. (1947) 177 L.T. 613, at p. 616.
4. [1931] A.C. 605.
5. (1950) 81 C.L.R., at p. 607.