Vending machine is very interesting human invention for modern days.
After paying, a product may become available by:
- the machine releasing it, so that it falls in an open compartment at the bottom, or into a cup, either released first, or put in by the customer, or
- the unlocking of a door, drawer, or turning of a knob.
The main example of a vending machine giving access to all merchandise after paying for one item is a newspaper vending machine (also called vending box) found mainly in the U.S. and Canada. It contains a pile of identical newspapers. After a sale the door automatically returns to a locked position. A customer could open the box and take all of the newspapers or, for the benefit of other customers, leave all of the newspapers outside of the box, slowly return the door to an unlatched position, or block the door from fully closing, each of which are frequently discouraged, sometimes by a security clamp. The success of such machines is predicated on the assumption that the customer will be honest (hence the nickname "honor box"), and need only one copy.