[efitz]

I dunno. I have a natural affinity for continuous vs discrete functions. But I also think thresholds cause bad behavior when you are near a threshold; you try to game the system by exceeding the threshold while trying to appear to be below it.

Corporate accountants are sophisticated enough to deal with formulae, and small businesses would be unaffected as the function changes very slowly at small numbers so even an error would likely not materially affect your return.

Calculation of market share would be more problematic.

And of course if you don’t like logarithms then choose your favorite exponential function.