Mars Bar Robot Chases Customers Around the Store and Tempts Them to Buy Candy
gizmodo.com
gizmodo.com
This would be a great scene in a movie set in the not too distant future. A robotic scrum, maybe they're all playing jingles, an older robot may bump into the protagonist...
I'm reality, I expect there are diminishing returns on this kind of thing and it will be managed by the store owner so you seldom have more than one robotic shelf following you around. A variant on it might be picking the shelf you want to come to you or shelves coming up to you based on your shopping profile. Maybe the convenience store of the future could be a hybrid restaurant or cafe. I sit down with a drink or snack and shelves come by my table so I can simultaneously do my shopping.
https://www.fastcompany.com/90302382/its-not-just-google-or-...
A more literal Mars bar robot.
Probably they will develop arms to gather in drop accidents, providing opportunities to slip in ringers.
The amusements multiply.