It’s one thing to write a book. But it sure would be  nice if people actually wanted to read it or even buy it. Now there’s a concept!

So as a writer, figuring out what drives book sales is helpful. Andrew Rhomberg, founder of Jellybooks, a start-up focused on reader analytics and helping readers discover books, has identified the top eight reasons why people buy books.

1. Immediate entertainment
2. Future entertainment
3. Information
4. Obligation
5. Social pressure
6. Wanting to sound intelligent
7. Gift giving
8. Impulse

Good to know. Now you just have to figure out how this information will play in to your marketing efforts.