All of the following are determinants of demand except :

Question

Accepted Answer

Option 3, "Quantity Supplied," is the correct answer because it is not a determinant of demand. Determinants of demand are factors that influence the quantity of a product or service that consumers are willing and able to purchase at a given price. Let's explore why each option is categorized as it is:

1. **Px (Price of the Good Itself)**: The price of the good itself is a primary determinant of demand. According to the law of demand, there is an inverse relationship between the price of a good and the quantity demanded. As the price decreases, the quantity demanded typically increases, and vice versa.

2. **Py (Price of Related Goods)**: The price of related goods, such as substitutes and complements, affects demand. For example, if the price of a substitute good (like tea for coffee) decreases, the demand for the original good (coffee) may decrease. Conversely, if the price of a complementary good (like sugar for coffee) increases, the demand for the original good may decrease.

3. **Quantity Supplied**: This is not a determinant of demand. Quantity supplied refers to the amount of a good or service that producers are willing and able to sell at a given price. It is a concept related to supply, not demand. The determinants of supply include factors like production costs, technology, and the number of sellers, but these do not directly affect consumer demand.

4. **Income**: Income is a significant determinant of demand. As consumers' income increases, they generally have more purchasing power, which can lead to an increase in demand for goods and services. Conversely, a decrease in income can lead to a decrease in demand.

In summary, Option 3, "Quantity Supplied," is correctly identified as not being a determinant of demand because it pertains to the supply side of the market, whereas the other options directly influence consumer demand.