Question 1: (Farming and sustainability of natural resources) Two farmers, Mary and Mason, graze their livestock on a common land. They can choose to use the common resource either "lightly" (at a sustainable rate) or "heavily" (at a destroying rate). The resulting strategic interactions and payoffs can be modeled as a simultaneous-move game with the following payoff matrix. (Note that the payoffs are the benefits from sustainable cooperation in the long run. Thus, they are desired payoffs, i.e. the higher the better!)

Farmer Mason Light Heavy Light 50 60 50 20 Farmer Mary Heavy 20 30 60 30