"[13] I turn to the second question, that raised by the plaintiff's contention to the effect I should add the amount required to meet the cost of fund management to the fund, and recalculate what is required, because any amount allowed will swell the fund and therefore be reflected in the charges ultimately made. Theoretically, this process could go on forever, although the plaintiff's counsel do not push the point so far. It is, indeed, a point reminiscent of the ancient mathematical fallacy of the hare and the tortoise: if, it was said, the hare can run ten times as fast as the tortoise, which has a ten yards start, while the hare runs the ten yards, the tortoise will go one, and while the hare runs that, the tortoise will go one tenth and so on, so the hare will never quite catch the tortoise! But, in my opinion, there is a simpler answer to the plaintiff's contention, which is not fallacious. The calculation of damages is not mathematically exact. It involves estimations. To strive for the precision the argument seeks in respect of the cost of the management of a fund components of which are themselves broad assessments of reasonable sums that are beyond calculation, such as damages for pain and suffering and the loss of the amenities of life, would just be incongruous. Furthermore, while a calculation utilising the figure of $ 2,700,000 in some way seems inescapable, it must be recognized, as McHugh J pointed out during the argument in Willett v Futcher, that even that basic step will lack precision, since a change in market conditions (a steep rise or fall in the share market, for instance) could, within a little time, change greatly the figure to which the Protective Commissioner's percentages will be applied, or, it may be added, a change in the regulation itself may intervene during the life expectancy of the plaintiff. It is, and must be, all a question of reasonable estimate which will determine the amount to be allowed. In my opinion, a sum calculated in the manner I have already indicated is the reasonable amount to allow in the present case."