“them. By far the best theory for describing the principles of our irrational decisions is something called Prospect Theory. Created in 1979 by the psychologists Daniel Kahneman and Amos Tversky, prospect theory describes how people choose between options that involve risk, like in a negotiation. The theory argues that people are drawn to sure things over probabilities, even when the probability is a better choice. That’s called the Certainty Effect. And people will take greater risks to avoid losses than to achieve gains. That’s called Loss Aversion. That’s why people who statistically have no need for insurance buy it. Or consider this: a person who’s told he has a 95 percent chance of receiving $10,000 or a 100 percent chance of getting $9,499 will usually avoid risk and take the 100 percent certain safe choice, while the same person who’s told he has a 95 percent chance of losing $10,000 or a 100 percent chance of losing $9,499 will make the opposite choice, risking the bigger 95 percent option to avoid the loss. The chance for loss incites more risk than the possibility of an equal gain.”