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The (Sometime) Tyranny of (Somewhat) Arbitrary Income Lines

As Lant Pritchett reports, the World Bank has introduced two new poverty lines: $3.20 for lower middle income countries, and $5.50 for upper middle income countries. I’m with Lant that this is broadly a good thing. But the process by which the World Bank came up with its new poverty lines suggests it might be worth revisiting some of the pitfalls of income thresholds at the individual or national level.