You can see this profit center being used by big time book publishers offline such as The Dummies Series®, Rich Dad Series®, Goosebumps, and many others to name.
If you have read a couple of books from series like these, I am sure you’ve come across some “inner cross promotions”. Things like:
“I’ve discussed this in depth in my other book, John Doe’s Guide to XYZ. So if you want to know more about XYZ, I suggest picking up a copy of my other book.”
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