Grocery stores have to deal with 1 - 1.5% profit or so some experts have said on TV, I don't know if its true or not. employees of places like Walmart and other grocery stores are already near the bottom of the barrel in pay. A method to make groceries cheaper, cost of business cheaper but could cost people their jobs. Problem is should we stop progress? One of the examples I've seen on tv is where customes scan bar code and then sits item in bag and a scale weighs it to make sure its the correct item. Smart shop lifters would switch bar codes between things that weight about the same. Other systems like the commercial on tv where the guy puts everything in an oversized overcoat and walks thru a scanner rely on micro radio transmitters. They have no battery the scanner transmits a low wattage (or is it amperage) and that powers all the transmitters on the groceries as you walk thru. But last I heard those things sold for 5 bucks a piece and that would be a huge mark up if thats what they used unless they brought the cost down in the last couple of years.