The third group which has five numbers represent s the product and the package size,but not the price. The manufacturers can choose any number they want. Different producers can have the same number for their goods. 20389 might be a tube of toothpaste for one manufacturer and a tin of tomatoes for another. Bar code also help shops with re-ordering. A shop's computer recognises the whole shape scanner at a shop's checkout counter. It reads the bar code and the price of the product appears on the till display. At the same time on item is deducted from the stock total.