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There might really be some people that wouldn't pick up Infected (the book), but once they start reading the free pdf, they might be inclined to pick it up after all.

I doubt that many people won't buy the book because they already got the free pdf wouldn't probably buy the book anyway because they would have gotten the electronic version of the book anyway (and not buy the physical book).

This campaign is done to prove Random House that this method already used last year with Ancestor can also work for big publishing companies.