Most of that is a play on definitions though. There's even an example of that in the charts: Apparently, 1% in 2014 has had a "basic education" but "are not able to read".
How does one define "extreme poverty" for example? There is actually a (vague) UN definition for that, but by common standard - since about the same time - it's currently defined as "earning less than 1 USD per day in 1996 dollars". While this is an extremely vague concept and does not even account for PPP, you could reasonably scale that back. However, going by the chart, they might not quite be using that definition either (because otherwise current levels would be twice as high).
How does one define "extreme poverty" for example? There is actually a (vague) UN definition for that, but by common standard - since about the same time - it's currently defined as "earning less than 1 USD per day in 1996 dollars". While this is an extremely vague concept and does not even account for PPP, you could reasonably scale that back. However, going by the chart, they might not quite be using that definition either (because otherwise current levels would be twice as high).
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