Sales grow at a decreasing rate and then stabilise. Producers attempt to differentiate products and brands are key to this. Price wars and intense competition occur. At this point the market reaches saturation. Producers begin to leave the market due to poor margins.
Promotion becomes more widespread and use a greater variety of media.
At this point there is a downturn in the market. For example more innovative products are introduced or consumer tastes have changed. There is intense price-cutting and many more products are withdrawn from the market. Profits can be improved by reducing marketing spend and cost cutting. In reality very few products follow such a prescriptive cycle.