If they said that self-checkout lanes would fail frequently because they have a lot of moving parts then they must have misunderstood the concept. (Incidentall

If they said that self-checkout lanes would fail frequently because they have a lot of moving parts then they must have misunderstood the concept. (Incidentally, I'm really tired of the "That's what people said about such-and-such" counterargument to any attempt to predict the future success or failure of a given technology. "Hey, I don't think there's a big market for home-based chemical vapour deposition systems" "Oh yeah, that's what they said about personal computers, hah!".) Anyway, self-checkout systems are instrinsically less prone to failure since they don't have all those things I mentioned like moving parts and messy substances to foul them up, and a single failure doesn't shut the entire supermarket down.