Actuary speak says that a “probability” is a chance from 1% to 100%.
Legal speak says that a “probability” is a chance greater than 50% (i.e. likely to occur) and a “possibility” is a chance of less than 50% (i.e. unlikely to occur) (Koch Consulting Actuaries Newsletter, 2018).
The court’s view is that claimants' losses should be based on the most likely progressions. This has resulted in “probable” scenarios being calculated at 100% and “possible” at 0%. It is therefore crucial that IOPs are clearly identifying the most probable earnings and progressions, and understand the impact of phrases that imply a postulation is unlikely (e.g. might, unlikely, best case scenario, may, possibly, should they).
If there is a greater chance of a particular scenario and the IOP wants the actuary to allow for it, they should state that it is likely, or alternatively, provide a percentage chance of occurrence. |