Twin study suggests rationality and intelligence share the same genetic roots - the study suggests that being irrational, or making illogical choices, might simply be another way of measuring lower intelligence.

[u/mvea]

https://www.psypost.org/twin-study-suggests-rationality-and-intelligence-share-the-same-genetic-roots/

[u/kryptylomese]

It would be interesting to ask the same people posed with the original question, if a ball cost $0.05 and a bat cost a dollar more than the ball , how much would the bat cost - and how much would they be worth total? And then ask why their first answer was wrong. We all take short cuts in thinking because biologically and evolutionary, it is more efficient (faster) and in some cases can save lives. This doesn't seem like a good test of irrationality - more of one that puts someone in a situation where they "could" take a short cut which leads to the wrong answer.

[u/fer-nie → u/kryptylomese]

This is the actual question from the article. It's different from what you posted above. The difference in wording is important.

A bat and a ball together cost $1.10. The bat costs $1 dollar more than the ball. How much does the ball cost?

[u/kryptylomese → u/fer-nie]

I did not quote anyone in my post. I stated a new question that could be asked after the first question that was the original and which you quoted.