In this example, the unit price shows that the corn flakes from the bulk food section are the better buy. When you know the unit price, you can compare similar products or different sizes. Many states require supermarkets to mark the unit price on the shelves or the price tags. Other states may require that the information given be correct and easy to understand. If you find that a unit price label or tag is missing or is incorrect, report it to the store manager immediately.
Many stores use electronic scanners to figure the price at the check-out counter.
These scanners are linked to a computer that reads the price of the item. Some scanners are hand-held and the clerk runs the scanner over the price tag. Other scanners are on a counter and the items are passed over an electronic reading device. The scanner reads a code on the product or the tag and the computer computes the price. Many weights and measures officials inspect scanners to make sure you are charged the correct price.