I wonder if you could explain the term "return illiteracy"? I'm not sure I can find out what you are talking about?
With regards to illiteracy, one thing that comes to my mind, is how to compare statistics with earlier times? For one thing we are now much more aware of functional illiteracy (which was, as far as I know, not taken into account earlier), and secondly, the modern society appear to require an overall higher degree of literacy. Since now more people than ever get further education (I can only speak for Scandinavia) this probably leave a smaller group more marginalised and alienated than ever before.
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