Halo inversion: Weak selection pressure on any positive trait tends to also select for all other positive traits; as pressure intensifies, the improvement of the primary trait increasingly comes at the expense of others instead.

Taller than average people are also smarter, stronger, healthier, richer, than average as well (if for no other reason than all of these traits are downstream of childhood nutrition and health). The tallest people are not the smartest, strongest, healthiest, richest people.

Be on the lookout! This phenomenon constantly crops up. And it catches people off guard constantly. “This attribute correlates with expected value, let’s target the ppl who score the very highest!” Oops.