Final answer:
The tendency of "Monday morning quarterbacks" to believe they could predict the outcomes of football games is known as hindsight bias, where people think an event was predictable after it has happened.
Step-by-step explanation:
The phrase "Monday morning quarterbacks" refers to individuals who critique and analyze decisions or events after they have already occurred, often with the benefit of hindsight. The tendency of these individuals to believe that they knew how a football game would turn out is explained by hindsight bias, which is the belief that an event, such as the outcome of a game, was predictable, even when it really was not. Hindsight bias is a common phenomenon where people overestimate their ability to have predicted an eventful outcome after the fact. It can contribute to an inflated sense of self-knowledge or intelligence, which might lead to overconfidence in one's ability to predict future events as well.