Shelter costs very little in poorer countries where the land is worth much less and building regulations and taxes are reduced (and some consumer goods Iranians don't expect to have or don't replace regularly cost more) which is one of the big problems with PPP adjustments trying to assess costs of living in different countries based on a basket of goods. Not that the unconventional method the article uses of scaling median income to suggest it's as high as $16k per year is any more representative. To the extent it's possible to compare the standard of living of an Iranian on UBI with a US standard of living it's probably in between those extremes...