Market expectations can influence the supply curve. Which statement best reflects this concept?

• A. Advertising
• B. Prices of substitutes in production
• C. Market expectations of future prices
• D. Income level of consumers

Answer: (C)

The main idea is that what producers expect about future prices can change how much they’re willing to supply today. If firms expect prices to rise later, they may hold back some current output so they can sell more at the higher future price, which reduces current supply at each price (a leftward shift of the supply curve). Conversely, if they expect prices to fall, they might rush to sell more now, increasing current supply (a rightward shift). This is why market expectations of future prices best reflect the concept.

Advertising tends to influence demand rather than supply directly, the prices of substitutes in production relate to what else producers could make rather than their expectations about future prices, and the income level of consumers also affects demand.