The article discusses how people make decisions about the future and why they sometimes prefer immediate rewards over delayed ones. It looks at a model called the discounted utility model and explains its history, assumptions, and problems. The researchers also talk about different theories that try to explain these issues. They review many studies that have been done on this topic over the years and explain why results can vary so much. The main point is that when we make choices about time, it's not just about how much we value the future, but also about other factors that can influence our decisions.