Trey has $5.00, he needs gas and he needs to eat lunch. He can only do one for $5.00 not both or part of both. Trey buys gas to go home. What is his opportunity cost? What is the alternative not chosen by trey?
Tray's opportunity cost is not being able to purchase lunch, the alternative tray decided not to take would I assume to be just getting gas and to eat at his house.