Suppose Tara decides to see the vultures. Which result would be a cost?
A: Tara will enjoy seeing the vultures more than she would have enjoyed seeing the alligators.
B: Tara will spend more time walking to the vultures. They are on the other side of the zoo, but the alligators are close by.
This result is a cost. It involves giving up or spending something that Tara wants or needs:
Tara will spend more time walking to the vultures. They are on the other side of the zoo, but the alligators are close by.