I am not sure why you were downvoted. There are several examples of the behavior you described. Potato chip companies reducing the quantity of chips in a bag b

I am not sure why you were downvoted. There are several examples of the behavior you described. Potato chip companies reducing the quantity of chips in a bag but keeping the size and price same. Because they were unable to raise prices with older packaging. Typically customers didn’t look at weight, just size of package. It was in the news for quite a while and IIRC there is a business case study. It has been happening in beverages and other items too. Why do you see now package weights of odd numbers like 11.5 or 14.5 oz instead of standard number like 12 oz or 16 oz with typically no price reduction. Recently I encountered same behavior with toothpaste tube in Japan. To keep the form/shape of the toothpaste tube with usage the nozzle was designed to suck in air to fill new space in the tube. My wife claimed we are out of toothpaste and wanted to throw away the tube. The toothpaste tube was perfectly formed but I noticed tube was still little heavier than I would expect for a empty plastic tube. But when you squeeze the tube mostly Air was coming out with little bit of spray of paste. Reducing the air space with paper clip, we were able to use paste from same tube for another 2 weeks. Typical behavior would be most probably what my wife was going to do to throwaway old one and open a new one.