Already discussed. BTW, I hate the idea for privacy reasons, but am not sure it’s actually economical. Self-checkouts have reached a certain penetration that doesn’t appear to be increasing.

Amazon’s system doesn’t appear to use RFID. I don’t see how maintaining a massive network of sensors would be any cheaper than a self-checkout register, or for that matter, a manned register.

This isn’t an e-toll road where we’re talking about cars passing in an orderly fashion though a fixed control point. I’m betting it also presupposes a way more orderly shopping experience than we get in NYC, especially during peak times.

You might have ten people right next to each other with mobile phones grabbing the same goods off the shelves, then replacing them and grabbing other goods.