A good deal was said to me about the manner in which I should estimate the damages which he has suffered by reason of his loss of earning capacity and limited opportunities of employment. Actuarial evidence was produced by Mr. Palmer, an actuary who came from Sydney. He produced a tabulation of present values of future weekly sums, calculated at 4½ per cent and 5 per cent. He also set out, from the Australian Life Tables, the expected duration of the plaintiff's life and of his working life (assuming a working life until age sixty-five) and so forth. It was sought to get him to go further and give his opinion of the future purchasing power of money; that is, to speak of currency values in the future. This evidence was objected to. It seemed to me that it would not be admissible; but I thought it best to hear briefly something of it so that I might know of its nature before ruling on its admissibility. I think I should say that the witness based his conclusions on certain statistical material to be found in the Commonwealth Year Book. The value of this data for the purpose for which he used it was not, I think, established. No doubt it is a commonplace that the purchasing power of the currency has fallen and that as time has gone on that has been manifested in various ways, by increased commodity prices, by increases in the basic wage - when there was a basic wage. The witness said that his conclusion from his consideration of this material was that for the purpose of determining the present value of future weekly payments the calculation should be on a 3 per cent basis - instead of the figures of 4½ per cent, 5 per cent, or 6 per cent which have been commonly used. This, he said, would take into account a continuing trend of decline in purchasing power. In my opinion evidence of the kind thus tendered is not admissible, for reasons which I shall give. I may say, however, that even if it were admissible I would put little, if any, weight upon it. I say that because the material on which Mr. Palmer based his conclusion is not in my view such as to enable anyone to make predictions which would be helpful for the determination of this case. It may be that, from the statistics he had which related to the last sixty years or so, a general trend can be perceived, and the purchasing power of money may be said to have declined. But it is well known that the economic history of Australia since about 1840, perhaps from an earlier date, has been marked by periods of booms and depressions. This makes me sceptical of any suggestion that I ought to assume that throughout the working life of this plaintiff there will be a continuous and uniform inflationary trend; and that for it an allowance can be made in assessing damages for loss of the earning capacity which, had it not been for his injuries, the plaintiff could have exercised during that period. However, quite apart from misgivings about the value of the evidence if it were admissible, I consider that I must reject it. I say this for two reasons. First, it is put forward as the opinion of the witness. Now Mr. Palmer is an actuary. He is no doubt in some senses skilled in the evaluation of statistical data; and he has given consideration to the matter on which his opinion was sought. But I am not persuaded that this qualifies him as an expert in economic prophecy. Secondly, and more fundamentally, it seems to me that the evidence was tendered upon a misconception; and that, however qualified as a prophet a witness might be, it is not receivable. It is true that in the endeavour to estimate the monetary sum to be awarded to a plaintiff as damages to compensate him for the diminution of earning capacity it is common practice to take as an initial measure the difference between the wages the plaintiff was able to earn week by week before the accident and what he is able to earn thereafter. By calculating the present value of an assessed weekly future loss thus arrived at, a capital sum can be determined which, after adjustments and allowances for various contingencies, is commonly described as "economic loss". It is however misleading to regard this method of assessing compensation for the destruction, total or partial, of earning capacity as a means of providing a plaintiff with periodic payments in the future. Damages are estimated for a present loss, a loss of a capacity or faculty. They are measured in terms of the money values prevailing at the time of the award. The plaintiff can use or apply the sum he is awarded as he chooses. He can if he chooses invest it and obtain in present conditions a yield of considerably more than 3 per cent. He is free, if he wishes and his circumstances permit, to buy property which if the currency continues to decline in purchasing power will or may increase, more or less correspondingly, in monetary value. The present case is a good illustration. The present plaintiff does not propose to purchase an annuity with whatever sum he may be awarded. He proposes to put what he gets towards the purchase of a flat or flats at Southport which he and his wife will look after and let to holiday-makers there.