4. What type of industry is best described by the "pure" Bertrand model? By the Cournot model? By the "smooth" Bertrand model? Explain why.

3. The components of marginal revenue Asim's HookNLadder is the only company selling fire engines in the fictional country of Alexandrina. Asim initially produced seven trucks, but then decided to increase production to eight trucks. The following graph gives the demand curve faced by Asim's HookNLadder. As the graph shows, in order to sell the additional fire truck, Asim must lower the price from $100,000 to $50,000 per truck. Notice that Asim gains revenue from the sale of the additional engine, but at the same time, he loses revenue from the initial seven engines because they are all sold at the lower price. Use the purple rectangle (diamond symbols) to shade the area representing the revenue lost from the initial seven engines by selling at $50,000 rather than $100,000. Then use the green rectangle (triangle symbols) to shade the area representing the revenue gained from selling an additional engine at $50,000. PRICE (Thousands of dollars per fire engine) 275 250 Asim 225 200 175…

O See Hint The graph below shows the marginal cost curve for two firms, A and B. Assuming these two firms together completely dominate their market, draw the market supply curve. Use the straight-line tool, and set the endpoints of the line based on the endpoints of the two given lines. To refer to the graphing tutorial for this question type, please click here. Price and marginal cost 160 150 140 130 120 110 100 80 70 60 50 40 30 20 10 160 る ろ 8さ88るるる Quantity supplied (thousands)

3. Profit maximization using total cost and total revenue curves Suppose Iyana operates a handicraft pop-up retail shop that sells cardigans. Assume a perfectly competitive market structure for cardigans with a market price equal to $25 per cardigan. The following graph shows Iyana's total cost curve. Use the blue points (circle symbol) to plot total revenue and the green points (triangle symbol) to plot profit for cardigans for quantities zero through seven (including zero and seven) that Iyana produces. TOTAL COST AND REVENUE (Dollars) 200 175 150 125 100 75 50 25 0 -25 D 4 5 QUANTITY (Cardigans) Total Cost 6 Total Revenue A Profit