A shopping trolley (or basket) which contains a fold-out step and allows small people to reach stuff they can’t get to on supermarket shelves (I’m constantly being asked by people to get them a packet of high-altitude cornflakes).
This would enable more stock to be accessible and make better use of expensive floor space. It might also allow extra pricing differentials/incentives: “Reach up for lower prices.”
If insurance companies stymie this, because they won’t allow shoppers to take on the dangerous task of climbing a step, then maybe some kind of vertical ‘magazine’ can be arranged, whereby products are fed in at the top and customers extract them at the bottom, automatically making available the next item. This would have the added advantage that products could be delivered to the shop in such feeder tubes…and the tubes themselves could announce to the stock control system when a tube was empty. In addition, the current danger of getting a glass jar of mayonnaise on the head would be eliminated.