A Level Economics AQA 2025 – 400 Free Practice Questions to Pass the Exam

The concept that describes a good that is demanded together with another is joint demand. Joint demand occurs when the demand for one good is directly related to the demand for another. This is often seen in complementary goods, where the consumption of one good enhances the consumption of another. A classic example of joint demand is the relationship between printers and ink cartridges; as more printers are sold, the demand for ink cartridges typically increases.

Composite demand, on the other hand, refers to a single good that has multiple uses, meaning that an increase in demand for one use can affect the availability for another use. Derived demand is the demand for a factor of production or good that arises from the demand for another good. Finally, elastic demand relates to how sensitive the quantity demanded of a good is to a change in its price, which is not about the relationship between two goods. Therefore, joint demand is the specific concept that correctly captures the relationship described in the question.