I also heard tell the illustrated manuscripts market is soaring.

> the author is wrong about textbooks.

The author didn't write an article about college textbooks, he wrote a response to an article about mass market books and affordability.

The forces which have made college textbooks (and college educations in general) unprecedentedly expensive, real though they are, have little to do with this article.

Edit: I re-read my original comment and I probably wasn't clear enough. The external distorting factor is the higher education system absolutely exploding costs of everything to do with higher education, from predatory professors and textbook companies to the rent-seeking and regulatory capture of higher education institutions. College textbooks got incredibly expensive for reasons having absolutely nothing to do with the actual costs associated with making books, which are arguably cheaper than they've ever been.