There has been lots of discussion on this topic. Many countries have a multidimensional measure of poverty, and there is also an international measure for it (h

There has been lots of discussion on this topic. Many countries have a multidimensional measure of poverty, and there is also an international measure for it (http://hdr.undp.org/en/content/multidimensional-poverty-index-mpi http://hdr.undp.org/en/content/multidimensional-poverty-inde...). The biggest problem is measuring it, so one standard income-based extreme poverty line makes sense in order to compare across countries. Also, like I said in another comment, this measure of poverty is power purchase parity adjusted, so currency changes should not affect.