3.4 In a large economics class of 430 students, each student would buy either one copy of the textbook or would not buy it. Students with different reservation prices for the textbook (the maximum price that the students would pay for the textbook) can be grouped as below: (Hint: Buyers and sellers are in groups, so you should regard it as a discrete case.) GROUP RESERVATION PRICE ($) NUMBER OF STUDENTS IN THE GROUP 550 40 500 50 450 60 400 60 InTMDOWD 350 60 300 80 250 40 200 40 There are also a few sellers who are willing to sell the textbook at or above the following prices. The sellers are price takers. SELLER RESERVATION PRICE ($) NUMBER OF COPIES IT SELLS 250 100 300 100 350 70 400 80