A. Use the inequality derived for part C question 3; to obtain an inequality required x *CD  = 1 to remain stable against DD invaders. Also draw the ROC diagram discussed in class for visually representing this stability inequality

B. Explain how a diagram similar to that shown in part A can be used to derive a prediction of what will happen to the CD players equilibrium probability of cooperating if the fear and greed pay off difference decrease relative to the cooperation payoff difference

C. Again explain how a diagram similar to that shown in Part A can be used to derive a prediction of what will happen to the CD player equilibrium probability of cooperating if they exchange email messages instead of talking talk face to face