A new study sheds light on why you might be overconfident in disagreements with friends or colleagues, even when you lack all the necessary information. Researchers found that people often assume they have enough knowledge to make an informed decision or stand by their position, even when this isn’t the case. This phenomenon is called the “illusion of information adequacy.” Angus Fletcher, a professor of English at The Ohio State University and co-author of the study, explains, “We found that, in general, people don’t stop to think whether there might be more information that would help them m…