How would we differentiate a genuinely huge discount from a mis-priced sale ? Ethically both parties are obliged to cancel the deal if the transaction doesn't i

How would we differentiate a genuinely huge discount from a mis-priced sale ? Ethically both parties are obliged to cancel the deal if the transaction doesn't incentivise both parties . But big players look at these as a good PR rather than mistake since the losses might be a fraction of what they are spending for marketing