For their economic class, students are asked to form pairs to
complete an assignment. The professor asks them to work together
but to turn only one copy of the problem set. Johnny and Kristen,
two students of the class, decide to work together. Both of the
students value the assignment. However, because Kristen and Johnny
received different grades at the exam, they do not value the
assignment the same way: Kristen would receive a payoff of 10 if
the assignment...