What consumer product that you think is particularly vulnerable to substitution?

One consumer product particularly vulnerable to substitution is bottled water. With an increasing focus on environmental sustainability, many consumers are shifting to reusable water bottles and water filtration systems, which offer convenience and reduce plastic waste. Additionally, the availability of tap water in many regions provides a cost-effective alternative, making bottled water less appealing over time. This trend underscores the growing preference for eco-friendly and economical options.