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For stock pickers it’s absolutely reversion to the mean.

If a millions monkeys flip a coin hundreds of times, you’ll inevitably have a few who have gotten all heads for all their flips

You'd need far more than a million monkeys to reasonably expect that result.

To give some context, two to the 100th power is 1,267,650,600,228,229,401,496,703,205,376.