on Jane Friedman site:

Book abandonment.

Yep, it’s a thing. The scenario looks like this:

Readers discover your book, perhaps by browsing the categories on Amazon, perhaps through a Bookbub ad. And with so many enticements—

• steeply discounted price
• mouthwateringly gorgeous book cover
• compelling book description

—they click the buy button. But after the first chapter, the third chapter, or even the first half of your book, they abandon your novel—never to return again.

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