Which of the following is NOT a determinant of supply?

The correct answer identifies consumer income as the factor that does not influence supply. Supply determinants are factors that specifically affect the quantity of a product that producers are willing and able to sell at various prices.

Input prices significantly influence supply because if the cost of production increases (due to higher prices for raw materials, labor, etc.), producers may supply less at any given price, shifting the supply curve to the left. Conversely, if input prices decrease, it can lead to an increase in supply.

The number of suppliers also affects supply; an increase in the number of suppliers generally leads to more goods being offered in the market, shifting the supply curve to the right. Hence, as more firms enter the market, the overall market supply increases.

Technological advancements are likewise a determinant of supply, as improvements in technology can enhance production efficiency, reduce costs, and encourage increased supply at every price level.

However, consumer income affects demand rather than supply. As consumer income increases, the demand for normal goods tends to rise, which may subsequently affect supply, but it does so indirectly by altering the consumers' willingness to purchase. Therefore, consumer income does not directly determine supply levels.