Which of the following is not a factor that might shift the supply curve for Product X?

Question

BlackTom AI · Accepted Answer

A supply curve represents the relationship between the price of a good and the quantity that producers are willing and able to sell; a change in the good’s own price causes movement along the supply curve, not a shift of the curve.

1) Relevant knowledge points and concepts
- Law of supply: higher price → greater quantity supplied, lower price → smaller quantity supplied (movement along curve).
- Supply shifters: factors other than the good’s own price that change producers’ willingness or ability to supply at every price (examples: number of sellers, production technology, input or production costs, taxes/subsidies, expectations).

2) Step-by-step reasoning
- Step 1: Identify whether each option affects the good’s own price or another supply determinant.
- Step 2: If it changes the good’s own price, it produces a movement along the supply curve (not a shift).
- Step 3: If it changes technology, number of sellers, or production costs, it alters supply at every price and therefore shifts the supply curve.

3) Calculations
- No numerical calculations are required for this conceptual question.

4) Why the correct answer is correct
- Option a states “An increase in the price of Product X.” Because the supply curve already shows how quantity supplied varies with price, a change in Product X’s price changes the quantity supplied along the existing curve (movement along the curve), not the position of the curve itself. Therefore it is not a factor that shifts the supply curve.

5) Why the other options are incorrect
- Option b (increase in number of sellers): More sellers increase market supply at every price → rightward shift.
- Option c (new low-cost technology): Improves productivity or lowers per-unit costs → increases supply at every price → rightward shift.
- Option d (decrease in production costs): Lowers cost to produce → suppliers supply more at each price → shift to the right.

6) Conclusion
- Therefore the correct answer is a. An increase in the price of Product X, which matches the provided answer.

Which of the following is not a factor that might shift the supply curve for Product X?单项选择题

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