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A lot of places have an invisible perimeter for shopping carts https://www.youtube.com/watch?v=-QKcprQD0zc https://www.youtube.com/watch?v=-QKcprQD0zc

• eru 4y ago
  Those are fairly new-ish.
  • amelius 4y ago
    According to the video, the tech is from the early 00s.
    • eru 4y ago
      Yes. And their widespread adoption in Germany can't have been before 2009 (when I left the country, and didn't really see them.) So by now it's a bit more than a decade at most.