Sellers have a moral imperative to figure out how much their stuff is worth by charging as much as they can.
When people stop buying what they’re selling, we know the product or service isn’t worth it, so the price comes back down.
When people stop buying what they’re selling, we know the product or service isn’t worth it, so the price comes back down.
When you're selling something people need to survive, like food or medicine, your moral imperative runs in the other direction, and profiteering at the expense of deep need is immoral in the extreme, especially if there are factors preventing competition so you have a captive market, like increased corporate concentration or a government-enforced monopoly.
You won't find it in Marx, Keynes, etc.
The only reason capitalism isn't 100% broken is because of regulation. Therefore we must accept that pure free market forces are not the morally superior path.