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