--Another interesting side note is accent. I'm British and have a 'home counties' accent (around London, but not a London accent), and I have been assured that my accent gives my opinions extra credibility and give me a additional perceived 10 iQ points or so.
@jgherbert I am so glad you brought this up, it has been a little known aspect of this quirky society that has annoyed me for many years. The ol' "you have a accent, so you must be much smarter than us none accent speaking people are !" I have seen this erroneous thinking carried out, thoughout my entire career, it was cute at first, now it is down right insulting.
British accents are approx. worth 10 + and you will have hit the jackpot if you have a German one ....that one is at least 50. What a joke and I give kudos to you for even mentioning it.
It is usually the (ironically) unspoken word amongst execs and HR.