It's about the cost of the checkout staff, not speed. Stores were told that if they bought 4 self-checkout kiosks they could eliminate 3 checkout staff (keeping

It's about the cost of the checkout staff, not speed. Stores were told that if they bought 4 self-checkout kiosks they could eliminate 3 checkout staff (keeping 1 to monitor 4 kiosks). What the vendors didn't say was that shrinkage would increase.