Say you have a melon in your fridge. And you find a soft spot on that melon, about the size of a nickel. Do you waste the whole melon? Of course not--you chop it up and throw away only the part that's bad.

Now, suppose you see that melon in the grocery store, with a little soft spot on it. Are you going to buy that melon? Probably not. If you're a store manager, do you want unsellable produce like that out on the floor? No way. So that melon--all 10 pounds of it--gets tossed in the trash. Wasted.