That's not the behaviour observed in the past. E.g. bottled water after Katrina was sold at eye watering prices, by the crate, to those who could afford it even

That's not the behaviour observed in the past. E.g. bottled water after Katrina was sold at eye watering prices, by the crate, to those who could afford it even though others actually needed water urgently. It still went in large quantities to people stockpiling. Capitalism isn't effective at distributing by need, only by ability to pay.