Final answer:
Option D, the number of buyers, is not a determinant of supply but rather a determinant of demand. The determinants of supply include factors that affect production and the seller's ability to provide goods, such as the costs of production, technology, and the number of sellers, not the number of buyers. (Option D).
Step-by-step explanation:
The question posed asks which of the provided options is not a determinant of supply. The determinants of supply typically include factors such as costs of production, technology, and the number of sellers in the market.
These factors directly influence the amount a firm is willing and able to supply at a given price. When it comes to choices A through C (Expectations, Technology, and Input prices), each plays a role in influencing a producer's supply. Expectations affect future supply decisions, technology can change the efficiency of production, and input prices can alter the cost of production.
However, option D, the number of buyers, is not a determinant of supply; it is actually a determinant of demand. The number of buyers impacts the quantity demanded in the market, not the quantity of goods or services a supplier is ready to provide.