Q. This graphing calculator illustrates the demand for spaghetti dinners served in all the restaurants in a society. Start by clicking on the Reset button to make sure that the cost of tacos the cost of wine also the average income in the society is set to their initial values. With the initial cost of $15 per spaghetti dinner write down the quantity demanded. After that reduce the cost of tacos to $2 also increase the average income in the society to $60,000. Observe the new quantity demanded.