UK ones have baskets you put stuff in, but they appear to be using multiple barcode scanners, at least for low value items. I'm guessing there is a cost-benefit

UK ones have baskets you put stuff in, but they appear to be using multiple barcode scanners, at least for low value items. I'm guessing there is a cost-benefit trade-off at some point, as well as a potential functional impact problem (hard to put an RFID tag in a solid lump of plastic!). The combination seems to work well though, and is certainly faster than most supermarkets.