24.A 1985 Harvard study showed that the price of cigarettes does not affect how much an individual smokes but whether he smokes. If this is correct, which graph in Figure 4-3 shows the typical individual's demand curve for cigarettes? a. 1 b. 2 c. 3 d. 4 25. Which of the following would be most likely to cause an outward shift of the demand curve for electricity? a. a decrease in the price of electricity b. an increase in the price of air conditioners c. an increase in the price of heating oil d. a decrease in the price of natural gas