Plus, you can check the dates of the products on the shelf yourself. It's amazing how often you find out of date stuff on the shelf... and how often I've had to point out said product to staff at a store. People don't rotate. That's not only a waste of food, but that's a health and safety hazard.
(It's a major pet peeve of mine. I have basically trained my wife to always check the dates of everything she gets before putting it in her cart. It took years before she finally saw what I was talking about, and I even remember the exact incident... we were at a Publix and getting some Toll House butterscotch and chocolate chips that were on sale for baking for a sleepover with our niece and nephews. I checked the dates... most of the bags were 8 MONTHS out of date! And it wasn't just the Toll House brand... many of the brands in that set were out of date, though 8 months was the furthest out I found. Needless to say, I showed the manager on duty there just how much of the set was out of date, and simply said, "You might want to consider rotating your product once in a while." I know I came off as condescending to him, mainly because my wife mentioned I did, but I didn't care because while I worked in that industry I always rotated my product... that's the proper way to work with groceries.)
