If you receive a free ticket to a concert, what, if anything, is your opportunity cost of attending the concert?
a. the pleasure yielded by the concert cancels any costs. thus, there is no cost of any type.
b. since the ticket was a gift, there is no opportunity cost.
c. the next best activity that can't be done while attending the concert.
d. the concept of opportunity cost does not apply to intangibles like concerts.