A friend offers you a Coke, a Dr. Pepper, or a 7-Up. You don't like Coke, so after some thought, you take the Dr. Pepper. What is the opportunity cost of your choice?

An opportunity cost is the value or benefit that must be given up to acquire or achieve something else. In this case whatever you choose (Coke, Dr. Pepper or 7-UP) everything would be free, at zero cost. This means that the opportunity cost in this case is zero, because the drink is free.