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by diffeomorphism 2468 days ago
Concrete Mathematics is 672 pages, hardcover for $72 on amazon.

Lord of the Rings is 3 hardcover books, 1214 pages total for $39 dollars.

Considering that you get much more "book" out of the second one, the content seems to be most of the price.

Similarly, if you look at China-only copies of math books, you pay about $10 (IIRC), which gets you admittedly bad quality paper and binding but still makes the publishers money.