What happens during the maturity and decline stages of the product life cycle?

"3. Maturity: After the growth stage, sales continue to mount—but at a decreasing rate. This is the maturity stage. Most products that have been on the market for a long time are in this stage. Thus, most marketing strategies are designed for mature products. One such strategy is to bring out several variations of a basic product (line extension). Kool-Aid, for instance, was originally offered in six flavors. Today there are more than 50, as well as sweetened and unsweetened varieties. 4. Decline (and death): When sales and profits fall, the product has reached the decline stage. The rate of decline is governed by two factors: the rate of change in consumer tastes and the rate at which new products enter the market. Sony VCRs are an example of a product in the decline stage. The demand for VCRs has now been surpassed by the demand for DVDs and online streaming of content. Sometimes companies can improve a product by implementing changes to the product, such as new ingredients or new services. If the changes are accepted by customers, it can lead to a product moving out of the decline stage and back into the introduction stage."