The following recreation demand function is for a beach: x = 4 − (p/500) + q. The visitation amount is represented by x (times), the travel cost is represented by p

(yen), and the water quality is represented by q (points).

a. Assume current water quality is 0 (q = 0). Express a given traveler’s consumer surplus if their travel cost were 1,000 yen.

b. Assume that when water quality improvement policy is executed, water quality increases by two points, resulting in q =2.

Express how muchthe water quality improvement policy was for the traveler.