If Alex has a talent for painting, but a utility function based on how much good music is composed, and Beth has a talent for composing music, but a utility function based on how many good paintings are made, they will want to trade terminal values.
If Alex has a talent for painting, but a utility function based on how much good music is composed, and Beth has a talent for composing music, but a utility function based on how many good paintings are made, they will want to trade terminal values.