One of the things that a customer hates the most is waiting in line at the checkout counter. Customers who are pressed for time wouldn’t want to spend a lot of time waiting for their turn. Others who came from work and are already tired do not have enough energy and patience to wait for those in front of them to pay for their purchases. Business establishments such as supermarkets recognize that there are several things that may contribute to a customer’s impatience which is why they do their best to have efficient cashiers and top of the line equipment such as barcode scanner. That way, the flow of customers paying for their purchases will remain steady.