20% of your effort realises 80% of effect… therefore we spend a lot of time squeezing out the remaining 20%. It separates the important few from the trivial many. An example would be 20% of time generates about 80% of code on a software project and all that remaining time is spent on a small portion due to whatever reasons. It’s just a rule of thumb and not a particularly accurate idea. 20% of people might control 80% of wealth. This probably isn’t that accurate in modern times but you get the idea.
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