[AleoMagus]

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And I believe that was what OP was asking.

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Fair enough. I mean, I know that's what the OP was asking. That's what everyone is asking when they ask about variance. Trouble is they keep calling it variance, and that's only a part of it.

...then the math inclined get frustrated when nobody gets why variance is pretty constant.

Believe it or not, I am not actually that formally trained in math myself, so I don't know it the metric I describe has a technical name. If it doesn't I nominate 'fluctuation metric' or maybe 'swing metric'. Even 'relative variance' seems ok, as that is what we are really talking about - variance relative to average profit.

I am pretty sure it must already have a name

Regards
Brad S