Although there are many different sizes and types of vending machines, they all work basically in the same way. The customer puts a coin into the machine and then pushes a button, pulls a lever, or opens a door to receive the merchandise. Some machines will also return change to the customer, and a few will make change for paper money. But the basic idea is the same. Customers like to save time and are usually willing to pay a higher price for this convenience.
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