Complementary Goods: Complementary goods are products that are used together, and the demand for one good is dependent on the demand for the other. For example, the demand for golf clubs is derived from the demand for playing golf.
Derived Supply: Derived supply is the supply of a product or service that is not directly produced, but rather is a result of the production of another, related product or service.
Elasticity of Demand: Elasticity of demand refers to the responsiveness of the quantity demanded of a good or service to changes in its price or other factors. Derived demand is often more elastic than direct demand.