Yesterday, we wrote about a paper on the relationship between having a high IQ and investing. It turns out that people with high IQs are better at diversifying, and have less-risky portfolios.

The authors used a pretty clever dataset to prove this. Every male in Finland has to go into the army, and take an IQ test, and all of their financial information is made public. So really there's a wealth of information in here about IQ and other demographic characteristics.

The below table is a gold mine.

Each column is one slice of the IQ spectrum (the ones on the right representing people with higher IQ scores.

As you can see, people in the latter columns have much higher income, are more likely to get married, and less likely to have kids.

Specifically on the kids front, 29.7 percent of the people in the lowest IQ column had kids. Of people in the second-lowest IQ category, 32 percent had kids. On the opposite end of the spectrum, just 26.6 percent had kids.

Download the full paper here >