Final answer:
The demand curve for product X shifts left with an increase in the price of a complementary product, doesn't shift with a price increase of product X itself, and shifts right with an effective advertising campaign.
Step-by-step explanation:
When assessing the impact of various events on the demand curve for a product, each event must be considered in terms of how it alters consumer behavior and demand factors:
- An increase in the price of a complementary product typically leads to a decrease in the demand for the product in question, causing the demand curve to shift to the left.
- An increase in the price of product X itself does not shift the demand curve, but rather moves along the curve, reflecting a change in quantity demanded, rather than a change in demand.
- Launching an effective advertising campaign for product X is likely to increase consumer interest and demand, shifting the demand curve to the right to reflect an increase in the quantity demanded at each price level.