i don't wish to over-simplify this subject but if you are privileged and exposed to a world of knowledge through university and travel, you should be smarter because of your ability in dealing w/many situations and experiences. if you are limited to what you have been taught and where you have gone, your mind will be smaller.
if you sit in a room and read all day, you may have a great knowledge of what you read and even a greater imagination. it is likely, though, that you will suffer in social circumstances.
obviously, i measure a person's i.q. w/their ability to critically think, make assessments and then decisions. if a person is naturally lacking in these abilities, this has to do w/an issue at birth.
we are all the same.