sorry for late reply -- I don't want to over-state my confidence on this, it could be I was wrong about PPP, and even if it is PPP it's possible that the comparison is missing somtehing. But I think part of the answer to your rent question is that many people in the developing world are living 1) multiple people to a room, in 2) informal settlements/structures that would not be legal in the US. And I do think it's possible to live off ~$60 a month for food in the US if you literally eat oats, rice and lentils -- it's terrible, I hope that goes without saying, but if we're just talking about what's possible I think that can explain the numbers.