In economics, what does supply refer to?

• A. It explains consumer preferences
• B. It is how much producers have
• C. The price of a good
• D. The demand for a good

Answer: (B)

Supply is the quantity of a good or service that producers are willing and able to offer for sale at different prices over a specific period. Saying it’s “how much producers have” captures the essential idea that supply reflects producers’ willingness and ability to sell at various prices, not just the amount they happen to possess at one moment. The link to price is central: as prices rise, producing becomes more profitable, so quantity supplied tends to increase; as prices fall, producers may supply less.

This is distinct from what buyers want and can purchase, which is demand. The price of a good is a single market price, not the overall supply. And the phrase “demand for a good” describes buyers’ side, not what producers are willing to sell. So the statement about producers and how much they have best matches the concept of supply.