Refer to the diagram above. Which of the following factors could have caused the change shown?

Question

BlackTom AI · Accepted Answer

A rightward shift of the demand curve (Demand0 to Demand1) means demand for Product X increases at every price — i.e., consumers buy more X at the same price. This is a change in demand (a shift), not a movement along the demand curve (change in quantity demanded due to X’s own price).

1. Relevant knowledge points and concepts
- Distinguish "change in quantity demanded" (movement along the curve caused by a change in X’s price) from "change in demand" (entire curve shifts due to non-price factors).  
- Factors that shift demand include tastes/preferences, incomes, prices of related goods (substitutes and complements), and expectations.  
- For complements, a decrease in the price of one good increases demand for its complement.

2. Step-by-step reasoning
- The diagram shows the entire demand curve moving rightward → at any given price P, Q demanded of X is higher after the change.  
- Such a shift must be caused by a non-price factor affecting demand (not a change in X’s own price).  
- Evaluate the options against this criterion.

3. Intermediate demonstration (example)
- Read the graph qualitatively: at a given price level (say P = $8) the quantity demanded is higher on Demand1 than on Demand0. That pattern holds across prices, confirming a demand shift rather than a movement along the curve.

4. Why the correct answer is correct
- Option c: A decrease in the price of Product Z, if Z is a complement to X, makes Z cheaper so consumers buy more Z and therefore buy more X as well. That increases demand for X at every price, producing a rightward shift.

5. Why the other options are incorrect
- a. Expectation that X’s price will fall next week would reduce current demand (consumers wait), shifting demand left, not right.  
- b. A decrease in consumer incomes (for a normal good) lowers demand, shifting left.  
- d. A decrease in the price of X produces a movement down along the same demand curve (increase in quantity demanded), not a shift of the entire curve.

6. Conclusion
Therefore the change shown is best explained by c. A decrease in the price of Product Z, a complement — which matches the provided correct answer.

Refer to the diagram above. Which of the following factors could have caused the change shown?单项选择题

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