As a PhD student at UC Davis, I had my tuition forgiven ($10k) and a salary of $18k/year as a teaching or research assistant. I could pay the rent and buy food (and wine!) fairly easily, but then I saw this on the wall at Simon Fraser University:
So, now I am wondering if other PhD students cannot afford to live on their stipends.
This question is not the same as that facing masters students (who seem to be cash cows for universities, i.e., they usually pay fees and get no salary) or undergraduates who are encouraged to study "whatever feels right" at schools that may have great dorm food and no interest in their future careers, debt or knowledge (read this reddit conversation).