Macroeconomics 1st Edition by Dean Karlan,Jonathan Morduch

تمرين 36

It's Friday night. You already have a ticket to a concert, which cost you $30. A friend invites you to go out for a game of paintball instead. Admission would cost you $25, and you think you'd get $25 worth of enjoyment out of it. Your concert ticket is nonrefundable. What is your opportunity cost (in dollars) of playing paintball?