Put otherwise: In the college education market, potential customers (students and their parents) know they will have access to credit on terms far laxer than what they would get if they borrowed from a private party without government subsidies, underwriting, or guarantees. This makes them more willing to borrow than would otherwise be the case, and allows colleges and universities to charge more for tuition, fees, and other services, because they know this artificial credit market can bear it, at least in the short run. It also allows others participating in the college education marketplace textbook publishers, for example--to charge vastly more for their products than they could possibly get for comparable markets outside of the higher education sector. Thus a hardcover non-textbook volume of 500 pages, with color pictures and a dust jacket, that might retail for $40 on Amazon, corn, would cost several hundred dollars if repackaged and sold as a course textbook. Of course, college textbooks are often written and edited by large teams of authors and printed on glossy, very high-quality paper when compared with the latest mass-market history tome by David McCullough. But that's precisely the point: While there is no reason a physics or economics textbook could not be authored by one person and printed on the same type of paper, and with the same proportion of illustrations, as any other hardcover, they are not, because those who manufacture and market textbooks are well aware that market distortions allow students (or their parents) to pony up $500 to $1,000 per semester for textbooks.