Suppose the inverse demand curve for a depletable resource is p = 15 - q. where p is the price in dollars per unit and q: is the quantity demanded. Suppose also that the marginal cost of production is constant at $3 per unit of output and the discount rate is 5%. a) (1 point) If the willingness to pay and the marginal cost are the same in each of two periods, what is the condition for dynamic efficiency? b) (4 points) If the supply of a depletable resource is limited at 20 units, what is the equilibrium quantity that will be produced in each of the two periods? c) (2 points) What is the equilibrium price in each of the two periods? d) (3 points) What is the marginal user cost in each of the two periods, and what does the marginal user cost in the first period mean