In a sample of almost 4,500 men, a positive correlation (.23) was observed between general intelligence and the general factor of personality (GFP). GFP captures one's ability to work well with others. According to the authors, general intelligence evolved to generate more resources while GFP evolved to secure a larger share of group resources.
The positive correlation suggests four types of people, two of which are more common and two of which are less uncommon. The more frequent types are smart-cooperative and dull-uncooperative people. Less common are smart-uncooperative and dull-cooperative folks.