These links are to studies and reports produced by university systems around the U.S. and the U.S. government.
Many stakeholders, each with an individual agenda, are involved with textbook pricing. Check these links to get a full understanding of the issues.
In a 2007 report, the U.S. Department of Education stated, "Nearly all the components of college expenses outpaced the CPI [Consumer Price Index] from 1987 to 2004 for both two-year and four-year public colleges. Although tuition and fees dominated the growth in expenses, textbook expenses rose more quickly than every other component at two-year public colleges, and every component but room and board at four-year public colleges. Textbook expenses rose far more rapidly than the prices of other commodities nationwide: 107% at two-year public colleges and 109% at four-year public colleges, compared to 65% for the CPI."
Also, a 2005 report from the General Accounting Office stated, "The average estimated cost of books and supplies per first-time, full-time student per academic year 2003-2004 was $898 at 4-year public institutions."