
Whether you are an individual making purchases from a store, a manager signing off a vendor bill for payment or a business owner making payment decisions, make sure you check the bills before you pay them because mistakes do happen. This is not a matter of somebody trying to cheat you, but simple mistakes such as hitting a wrong key or forgetting that discount you negotiated when you phoned in your order.
People generally do not try to cheat you, but even if they do they would be relying on you not checking. Many stores have a sign by the cash register: "Please check change before you leave!" That's not just because some try to claim to be short-changed, but also because some are short-changed because the cashier made a mistake....