What may cause a product to reach a decline stage in its life cycle?

The decline stage of a product's life cycle often occurs due to a change in consumer tastes. As preferences evolve, products that were once popular may not align with current consumer desires, leading to decreased sales. This shift could be influenced by various factors such as trends, technological advancements, or cultural changes that make the product less appealing. While high competition can also affect a product's success, it is primarily a change in consumer preferences that directly prompts declining interest and sales.

Increased advertising and successful product improvements typically aim to stimulate demand or rejuvenate interest in a product, potentially extending its life cycle rather than contributing to a decline.