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"Analysts at the Yankee Group have predicted that the US ebook reader market is "about to catch fire sparking from $1.3bn (£0.86bn) in revenue in 2010 to $2.5bn (£1.65bn) by 2013". "

They say that the books will be device agnostic and that competition between Apple, Amazon and Google will probably split the market.

"Therefore, we expect Amazon's share of e-books business to fall from 90% currently to about 35% over the next five years."