Most of the low GDP poverty lines were established using a cost of basic needs methodology. This looks like the same pdf that World Bank paywalls:<p><a href="http:&#x2F;&#x2F;core.ac.uk&#x2F;download&#x2F;pdf&#x2F;6645038.pdf" rel="nofollow">http:&#x2F;&#x2F;core.ac.uk&#x2F;download&#x2F;pdf&#x2F;6645038.pdf</a>