5 (a) The tobacco company has mounted a very successful advertising campaign in favor of cigarette smoking directed at consumers. Show and explain the effects of this on a demand/supply diagram for cigarettes.

(b) Based on your graph above, can some people actually end up decreasing their consumption of cigarettes? Show and explain.

(c) Suppose there is a shift in the demand curve but there is no change in the amount of cigarettes sold. Show and explain how that might happen.