Abstract
Authors John L. Hilton III and David A. Wiley discuss the concern many college students and their families have a=about the high costs of textbooks. E–books have been proposed as one potential solution; open source textbooks have also been explored. A company called Flat World Knowledge produces and gives away open source textbooks in a way they believe to be financially sustainable. This article reports an initial study of the financial sustainability of the Flat World Knowledge open source textbook model.