Although there are many different sizes and kinds of vending machines, they all work in nearly the same way. People put money into the machine and then open a door to receive what they buy. Some machines will also return change to the people, and a few will even give change to paper notes. But the idea is the same. People like to save time and are usually willing to pay a higher price for this convenience.

Although there are many different sizes and kinds of vending machines, they all work in nearly the same way. People put money into the machine and then open a door to receive what they buy. Some machines will also return change to the people, and a few will even give change to paper notes. But the idea is the same. People like to save time and are usually willing to pay a higher price for this convenience.