200 180 Revenue Lost 160 140 120 Revenue Gained 100 Demand 80 60 40 20 1 2 3 4 6 7 8 9 10 QUANTITY (Fire engines) Manuel increase production from 8 to 9 fire engines because the dominates in this scenario. PRICE (Thousands of dollars per fire engine)

1. Price and output in a competitive price-searcher market Consider a price-searching firm, Sean's Fire Engines, which sells fire engines in the fictional country of Pyrotania. Initially, Sean's produced six fire engines but then decided to increase production to seven fire engines. The following graph shows the demand curve the firm faces. To sell the additional engine, Sean's must lower its price from $100,000 to $50,000 per engine. (Hint: Sean's Fire Engines gains revenue from the additional engine it sells, but it also loses revenue from the initial six engines because it sells them all at the lower price.) On the following graph, use the purple rectangle (diamond symbols) to shade the area representing the revenue lost from the initial six 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. re engine) 250 225 200 Q Search Revenue Lost Col

img' (a If po increases, what happens to the demand and supply of public transportation (shifts left/shifts right/doesn’t change) What happens to the equilibrium quantity and price for public transportation? (increase/decrease)   (b)At a given price p, as oil becomes more expensive (po increases), does the (own) price elasticity of demand for public transportation increase / decrease / stay the same?   (c) Calculate the cross-price elasticity of public transportation demand with respect to the oil price po, at the point p = 1 and po = 2. Are the two goods (public transportation and oil) substitutes or complements, or unrelated?

Price $3 2 10,000 20,000 30,000 S D Quantity Refer to Figure 4-4. The figure above represents the market for iced tea. Assume that this is a competitive market. At an output of 10,000 units the marginal benefit of iced tea is greater than the marginal cost; therefore, output is inefficiently high. the marginal benefit of iced tea is greater than the marginal cost; therefore, output is inefficiently low. the marginal cost of iced tea is greater than the marginal benefit; therefore, output is inefficiently low. producers should lower the price to $1 in order to sell the quantity demanded of 10,000.