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