via phys.org:
A behavioral economist at the University of Bath in the U.K. has found evidence linking higher levels of unwarranted financial optimism with lower levels of cognitive ability. In his study, published in the journal Personality and Social Psychology Bulletin, Chris Dawson surveyed thousands of people in the U.K. about their economic outlook and compared their responses with their true financial outlook.
Prior research has found links between a sunny outlook and better health and also a higher overall quality of life, including better relationships with people. But it has also shown that being overly optimistic can lead people to make poor decisions, such as how much to save for retirement. In this new study, Dawson looked for an association between unrealistic optimism and cognitive ability regarding financial decision-making.
Suspecting that people with lower cognitive abilities tended to overestimate their financial acumen, and thus make poor financial decisions, Dawson accessed the data repository of the Understanding Society project, which conducted a longitudinal survey involving more than 40,000 households in the U.K. and Northern Ireland over the years 2009 to 2021. He also analyzed data from the British Household Panel Survey run from 1991 to 2008.