The following graph shows the demand curve for sedans in New York City. For simplicity, assume that all sedans are identical and sell for the same price. Initially, the graph shows market demand under the following circumstances: Average household income is $50,000 per year, the price of a gallon of regular unleaded gas is $4 per gallon, and the price of a subway ride is $3.00. Use the graph input tool to help you answer the following questions. You will not be graded on any changes you make to this graph. Note: Once you enter a value in a white field, the graph and any corresponding amounts in each grey field will change accordingly. Graph Input Tool (?) Demand for Sedans Demand for Sedans 40 Price of a sedan 20 Thousand of dollars) 30 Quantity 450 Demanded (Sedans per month) PRICE (Thousands of dollars per sedan) 20 Demand Shifters Average Income 50 Thousands of 10 Demand dollars) Price of Gas (Dollars per gallon) Price of a Subway 0 Ride 0 100 200 300 400 500 600 700 800 900 (Dollars) QUANTITY (Sedans per month) Consider the graph. Suppose that the price of a sedan decreased from $20,000 to $15,000. This would cause a the demand curve . A decrease in average income causes a leftward the demand curve; therefore, you may conclude that sedans are good. (Hint: Try substituting different values for Average Income in the graph input tool and observing what happens.) Suppose that the price of a gallon of gas rises from $4.00 to $5.00. Because sedans and gasoline are , an increase in the price of a gallon of gas shifts the demand curve for sedans to the