I just realized that the mass production of this cart would be costly and it would make it harder for food markets to want to spend the money. If it's possible I think it would be cool to have the same concept but it would be attachable to existing shopping carts on wither the left side or right side. Also that way the children would stay next to their parents. This way you use less platics and you save a lot of money on the wheels so it would cut costs.
You know this is a great concept. I have seen shopping carts that have a little passenger seat with a TV in it. Instead they should spend 1/20 of that cost to have a little side tray that attaches to shopping carts that has your concept. So variety of foods can be put in portions.