Final answer:
Expectancy value theories assume that the actions of humans cannot be predicted without an understanding of people's rational expectations.
Step-by-step explanation:
Expectancy value theories assume that the actions of humans cannot be predicted without an understanding of people's rational expectations. According to this theory, people form the most accurate possible expectations about the future by using all information available to them. This includes looking at past experiences and gradually adapting their beliefs and behavior as circumstances change. It is important to note that not all individuals are well-informed or have perfect information synthesis, so the theory of adaptive expectations is also considered.