Which of the following would NOT cause a shift in the supply curve for a crop?

• A. A change in the product's own price.
• B. Technology improvements.
• C. Prices of inputs.
• D. Expectations of future prices.

Answer: (D)

The key idea is that supply can shift or move along the curve. Non-price determinants—like technology improvements, input prices, and expectations of future prices—change the entire relationship between price and quantity supplied, so the curve shifts. Changes in the product’s own price, however, only change how much is supplied at that price, causing a movement along the curve rather than a shift of the curve itself. Technology boosts or reduces production efficiency, input price changes alter production costs, and expectations about future prices can influence current production decisions; all of these shift supply. Therefore, a change in the product’s own price is the factor that would not shift the supply curve.