Max Roser and Joe Hasell have written a post defending the methodology behind their long-term poverty graph. It is not addressed to me, but it was written in response to my critique (which you can read here).
Unfortunately, their response doesn’t engage with most of my substantive arguments. They do not address the evidence on how the $1.90 line is too low to be meaningful. They call $1.90 “extreme”, which it is – and that is precisely why it should not be used in public communication. Remember, the World Bank has repeatedly pointed out that it is too low to inform economic policy. Why then should it be acceptable for Gates, Pinker and Roser to use it to inform public discussion about economic policy (i.e., whether the global economy is working for the world’s majority or not)? As I see it, Roser should stop using $1.90 in his flagship graphs.
Roser and Hasell also do not address the critique, made by Sanjay Reddy and many others, that the PPP baselines that underpin the $1.90 line overstate the purchasing power of the poor. Nor do they address my argument that progress against global poverty is actually worsening, when poverty is measured against our capacity to end it.