Have you read The Millionaire Next Door? The book is about people of very ordinary intelligence who are more rational about money than many smarter people.
I haven't read it but I don't think this kind of example talks directly to the question of whether rationality is a strongly heritable trait independent of IQ. My current hypothesis (not strongly held or supported by large amounts of evidence) is that rationality is more a learned skill or habit of thinking which will tend to correlate with IQ (because higher IQ people will learn it easier/faster and apply it better) but that some high IQ people have failed to learn it and some lower IQ people have become quite good at it.
Examples of lower IQ people who a...
The question that the ideas are supposed to be in response to is:
Here are links to some proposed ideas that you should vote for, assuming you agree with them. You do have to register to vote, but the email confirmation arrives right away and it shouldn't take much more than two minutes of your time altogether. Why should you do this? The top voted ideas from this request for ideas will be seen by some of the top policy recommendation makers in the USA. They probably won't do anything like immediately convene a presidential panel on AGI, but we are letting them know that these things are really important.
Research the primary cause of degenerative diseases: aging / biological senescence
Explore proposals for sustaining the economy despite ubiquitous automation
Establish a Permanent Panel or Program to Address Global Catastrophic Risks, Including AGI
Does anyone have any other ideas? Feel free to submit them directly to ideascale, but it may be a better idea to first post them in the comments of this post for discussion.