Which of the following is most likely to cause the demand curve for a product to shift to the left?

Question

BlackTom AI · Accepted Answer

A leftward shift in the demand curve means demand decreases: at every price consumers now want to buy less of the product than before.

1. Relevant knowledge points and concepts
- Demand curve shift vs. movement along the curve: a shift occurs when a non-price determinant of demand changes (preferences, income, prices of related goods, expectations, number of buyers). A leftward shift = decrease in demand.  
- Examples that decrease demand: tastes shifting away from the good, decreases in number of buyers, lower income for a normal good, or an increase in the attractiveness/availability of substitutes.

2. Step-by-step reasoning
- Identify each option as a non-price determinant and determine its effect on demand.  
- If customers’ preferences shift against the product, fewer consumers want it at any price → demand falls → demand curve shifts left.  
- If substitute price rises, consumers switch toward this product → demand increases → rightward shift.  
- A successful advertising campaign increases consumers’ desire → demand increases → rightward shift.  
- A technological advancement in production affects supply (costs) not demand; it shifts the supply curve rightward (more supplied at each price), not demand.

3. Calculations
- No numerical calculation is required; reasoning is comparative and directional.

4. Why the correct answer is correct
- Option 1 directly reduces consumers’ willingness to buy at all prices (a tastes/preference effect), which is the textbook cause of a leftward demand shift.

5. Why the other options are incorrect
- Option 2 (higher substitute price) raises demand for this product (right shift).  
- Option 3 (successful advertising) increases demand (right shift).  
- Option 4 (production technology) affects supply, not demand, so it does not shift the demand curve left.

6. Conclusion
- Therefore the demand curve is most likely to shift left when customers’ preferences shift against the product (Option 1), matching the provided answer.

Which of the following is most likely to cause the demand curve for a product to shift to the left?单项选择题

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