Prospect Theory is a way to understand how people make decisions when faced with risks. This study looked at how Prospect Theory can be used in situations where decisions are made over time. The researchers found that weighting probabilities of present values is the best way to predict decisions in these cases. The way people weigh probabilities in these situations is similar to how they do it in simpler, one-time decisions. The study also showed that people tend to be more averse to losses than they are motivated by gains.