I do wonder about that figure, is that for people in the US because it is just above the mean US salary. In some parts of the world you would be very comfortable on that salary, in other parts you will struggle to find accommodation.
Yeah, it's from US data. In some places even $200/mo lets you live like a member of the upper class... I originally remember hearing the figure from a TED talk ( here it is, highly recommended http://www.ted.com/talks/daniel_kahneman_the_riddle_of_exper... ), and since then there have been a few other sources I can't remember right now.
