I don't know where the idea "everyone" will be able to achieve a certain minimum reading comprehension came from and it's trivial to show that wouldn't be true.

I don't know where the idea "everyone" will be able to achieve a certain minimum reading comprehension came from and it's trivial to show that wouldn't be true. As I understand it, the topic is more about the differences between countries in the chart rather than somehow achieving 100%. E.g. how Ireland sits around 87% while Senegal sits at 2%. If Senegal were able to afford the same overall quality of education for their students as Ireland don't you think the would have significantly higher numbers?