Lem made quite a good prediction about ebook readers: "The books were crystals with recorded contents. They can be read the aid of an opton, which was similar

Lem made quite a good prediction about ebook readers: "The books were crystals with recorded contents. They can be read the aid of an opton, which was similar to a book but had only one page between the covers. At a touch, successive pages of the text appeared on it." In old Polish sci-fi I really appreciated the sociological aspect of some of the books, especially these written by Janusz Zajdel (https://en.m.wikipedia.org/wiki/Janusz_Zajdel https://en.m.wikipedia.org/wiki/Janusz_Zajdel). Unfortunately it seems none of his work was translated to English. In Zajdel's Limes Inferior we have a society divided into classes. The monetary system was divided into points (green, red and yellow) and being in the lowest class you would only earn green points that should cover necessities. For premium items you would need red or yellow points. There is of course a black market exchanges etc. Another interesting concept from this book were 'keys' - every one had their own andb they were used as an id and a wallet for the points (I think they would perform similar functions to mobile phones of today).