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Three out of four investors will underperform the index thanks to the Pareto Distribution through no fault of their own.
Pareto Distribution
The Pareto distribution, named after the Italian civil engineer, economist, and sociologist Vilfredo Pareto, is a power-law probability distribution that is used in description of social, quality control, scientific, geophysical, actuarial, and many other types of observable phenomena.
https://en.wikipedia.org/wiki/Pareto_distribution