Suppose you want to remove ten fish of an exotic species that have illegally been introduced to a lake. You have three possible removal methods. Assume that q1+q2+q3=10.

a) If the marginal costs of each removal method are respectively $15q1, $7.5q2, and $2.5q3 how much of each method should you use to achieve the removal cost-effectively?

b) Why isn't exclusive use of method 3 cost-effective?

c) Suppose that the three marginal costs were constant (not increasing as the previous case) such that MC(1)=$15, MC(2)=$7.5 and MC(3)=$2.5. What is the cost effective outcome in that case?