Although an overall higher IQ will generally be an advantage in nearly every endeavour, keep in mind that there are different kinds
of intelligence,some person they excel at other endeavours. Bearing all this in mind, certain kinds of intelligence might make one a better trader than those who lack said intelligence to some degree, the kind of intelligence is depend on
person ability,to used it from different field, those are characteristics of a general IQ, but they are specific traits in certain people,it just like same with traders, what those qualities might be exactly, would need to be teased out in research.
I'm also agree to that case,that rather analytic mind can understanding of the market that required,sometimes in person may not know what IQ is and trade greatly, when trading on a profitable system,due to robots can trade again , if one person can perform as mechanical actions will result at the same time to earn with profit, although intelligence often makes the income bigger,but I really doubt that course advisors are written by people with low IQ,are not required to be trade?