80/20 Magic

The 80/20 precept insists that there's an inherent imbalance
between inputs and outputs, causes and consequences, and
work and result. It says that a minority of causes, inputs or
effort commonly lead to a bulk of the result, outputs or
rewards. A couple of things are crucial; most aren't.
A great benchmark for this unbalance is furnished by the 80/20
relationship: a typical pattern demonstrates that 80% of yields
result from 20% of inputs; that 80% of outcomes stem from
20% of efforts; or that 80% of consequences come from 20% of
work. It reflects kinships in nature, which are an involved
mixture or order and disorder, or regularity and abnormality.