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I doubt it works on me. I have bought smaller items due to doing the per unit price in my head (don't trust what they put there and two often then apples and organges the units) or completely not bought something or bought some alternative (potatoes instead of bread or rice instead of potatoes).
Doesn't it have its roots in forcing clerks to give change and recording the sale (rather than pocketing the money)?
But its true though, don't you think they would save on the printer ink if it wasn't the case?