The last stage of the product life cycle is decline.
A product life cycle represents the stages through which a product passes from its introduction in the market to its eventual withdrawal. These stages include introduction, growth, saturation or maturity, and decline.
After the saturation stage, the market becomes fully served and sales stop growing. Gradually, sales begin to fall due to factors such as changing consumer preferences, technological advancements, or the availability of better substitute products.
During the decline stage, profits decrease and firms may reduce marketing efforts, lower prices, or discontinue the product completely.
Hence, the final stage of the product life cycle is known as the decline stage.