OpenStax College, Rice University: On-line Principles of Economics Text
Building upon the development of quality textbooks for large enrollment college courses such as biology and psychology, OpenStax made an application and received funding to develop an on-line text book for both introductory micro- and macro-economic classes. The basis of the text is an introductory principles book written by Tim Taylor. A writing team helped update the text adding interactive video and supporting materials as well as additional problem sets.
First released in 2014, the text is gaining wide adoption among a variety of two- and four-year institutions. Because it is an on-line book, it can be easily updated with video, print and other on-line information. Because OpenStax College is supported by a several foundations, including Gates and Hewlett Packard, the books are free of charge to all students. PDF copies can be ordered for a minimal amount and a hard-cover version is available as well.