A good grocery store will waste less. They'll have someone merge multiple cartons of eggs to refill ones that have one cracked (assuming the carton isn't soaked). They'll see they have a bunch of inventory about to go past sell-by and will toss up a sale to get rid of as much of the near-expiration items. They'll be careful about rotating stock so that the older items are up front so people who are less date-sensitive will buy them.