What is a non linear demand function?

A non-linear demand function describes the relationship between the quantity demanded of a good and its price in a way that does not form a straight line when graphed. Unlike linear demand functions, where changes in price lead to constant changes in quantity demanded, non-linear demand functions can exhibit varying rates of change, often reflecting factors such as consumer preferences, income levels, and market conditions. This complexity allows for more accurate modeling of real-world demand behaviors.