Traditionally, big publishers (who were all in big bookstores before the advent of the Internet) would have tended to say cover design and title.
Today, it would seem, things have changed a little. A sample of the book (maybe a few pages), its cover and a short blurb (perhaps a few sentences) tend to lure the majority of her sample pool. And while reviews still have an important influence on buying patterns, the rise of social media has allowed Facebook, Twitter and blogs to also play a role in shaping purchasing habits.
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