Scott Adams talks about how one can dramatically increase their odds of success by learning multiple skills. You might imagine adding languages to your skill set is a smart play. Learning the Art of Negotiation on top of those skills is a force multiplier.
Incidentally, Adams book is a brilliant read, full of solid, unconventional career advice > http://www.goodreads.com/book/show/17859574-how-to-fail-at-a...