Don_DickleIf someone opened a store and just sold stuff at cost, which undercuts every other competitors by alot. Would this not for the big corps to come way down on their prices?
Adding to what everyone else said, stores commonly sell loss leaders as a way to get people into the store to sell goods with higher margins. Part of the reason why there are so many food deserts in the USA is because stores like Dollar General will sell higher margin stable goods at a lower cost. This means grocery stores who rely on those profits to sell fresh produce and meat can’t compete, going out of business.