Economic short answer
2.a. To maximize profits, it is necessary to produce the quantity when the marginal revenue is higher than the marginal cost. In Q=8 the marginal revenue is higher than the marginal cost, from Q=9 the marginal revenue is lower than the marginal cost. Then the answer is Q=8. 2.b. The data represents a not perfectly competitive firm because the graph is not horizontal, but a downward-sloping demand curve (Piana). 4. A downward-sloping demand curve says that the final price of an article at a crescent quantity will decrease reducing the marginal revenue of the last produced article. 5. The ...