“In determining what did happen in the past a court decides on the balance of probabilities. Anything that is more probable than not it treats as certain. But in assessing damages which depend upon its view as to what will happen in the future or would have happened in the future if something had not happened in the past, the court must make an estimate as to what are the chances that a particular thing will or would have happened and reflect those chances, whether they are more or less than even, in the amount of damages which it awards.”
“You can prove that a past event happened, but you cannot prove that a future event will happen and I do not suppose that the law is so foolish as to suppose that you can. All you can do is evaluate the chance. Sometimes it is virtually 100 per cent.: sometimes it is nil. But often it is in between. And if it is somewhere in between I do not see much difference between a probability of 51 per cent. and a probability of 49 per cent.”