Draw a game tree that represents the ultimatum game in which the proposer is a first mover who decides how much to offer a responder and the responder then decides to accept or reject the offer. The total amount available is $ 50 if agreement is reached, but both players get nothing if the responder rejects the offer. Offers must be in whole dollars. What is the subgame-perfect Nash equilibrium? What would you expect to happen in practice?