What standard of proof does a hypothetical event meet?

The standard of proof in relation to future events is simple probability. Hypothetical events are to be given weight according to their relative likelihood: Athey v. Leonati, 1996 CanLII 183 (SCC), [1996] 3 S.C.R. 458 at para. 27.

As stated in Perren v. Lalari, 2010 BCCA 140, there are two possible bases for assessing loss of future earning capacity: the earnings approach and the capital asset approach. Where the loss is quantifiable in a pecuniary way, the earnings approach will be appropriate, while the capital asset approach will be appropriate where it is not: Perren at para. 32. In this case, the mathematical earnings approach is appropriate because the sums payable for full-time and part-time work are easily determined. The plaintiff has an established career in a field where demand is strong and her position is secure.