Also please don't hang yourself on the 20%. In some cases its 90/10, in others 30/70.
It is not a law proofed my math, but a principle, a rule of thumb based on observation.
But you find that nearly everywhere. Even in nature, where 20% if the area hosts 80% of the (diversity) of species.
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I remember reading a book on it a few years ago, I'll have to have another skim through :)