Disclaimer: these cold numbers expressing typical IQ for different occupations must be interpreted very carefully. They don't necessarily imply anything. The outcome depends on the character of the question, discrimination, etc. Despite different numbers, all of us are equal. Blah blah blah. And so on.
If you trust these numbers, one of the conclusions is that the economists are the brightest among the social scientists (rank 4) who are only followed by philosophers (rank 9). The philosophers are still brighter than political scientists (rank 17) who are smarter than the sociologists (rank 23). This list may confirm virtually all of your preconceptions about all these fields, at least it was my case. The only exception was medicine that I expected to appear in the upper half.