How many types of demand functions are there?

There are several types of demand functions, but they can generally be categorized into three main types: linear demand functions, non-linear demand functions, and elastic demand functions. Linear demand functions express a straight-line relationship between price and quantity demanded, while non-linear functions can take various shapes, reflecting more complex relationships. Elastic demand functions measure how sensitive the quantity demanded is to changes in price, indicating whether demand is elastic, inelastic, or unitary. Each type serves different purposes in economic analysis and modeling.