Books by the Pound: The London Book Fair — how do you weigh the impact of digital sales?

"The e-book era has clearly arrived, but can publishers' digital revenues grow fast enough to offset the worldwide decline in sales of physical books? About half of all books are bought on impulse—sales that result from attractive displays in inviting surroundings, which are readily accessible to the most literate, well-heeled customers (aka 'the heavy book buyer')."
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