Only when the purchase price of a fruit shop is lower than the normal price can it sell fruit at a price lower than the market and make a profit; Unless the sales volume of the fruit store is large, you can't buy fruit lower than the normal price from fruit farmers; In order to have a large sales volume, the fruit shop must have the exclusive sales right of specific varieties of fruits. For various reasons, the fruit shop did not get the exclusive sales right of specific varieties of fruits
it follows that
The fruit shop cannot profit by selling fruit at a price lower than the market price