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The effect can clearly be seen in the latest sales figures released by the Association of American Publishers (via GalleyCat). In the first half of 2011, e-book revenues rose 160 per cent to $390m while adult hardback revenues fell 23 per cent to $386m.
As my colleague Andrew Edgecliffe-Johnson wrote in April, e-book sales briefly overtook those of adult paperbacks in February but it was an unusual month. Adult paperback sales outstripped e-books in the first half as a whole, falling 18 per cent to $473m.