Textbook prices are traditionally high. " Combined with the rising cost of tuition, the price of books for our students is just killing these kids," said Peter Jason, Ph.D. , a local community college professor. Adding to that problem, many college instructors change textbooks year after year: they either upgrade to a new edition or switch to an entirely different textbook. This further hurts students because if an instructor no longer uses a particular textbook, that book has no resale value. Students are one of the poorest groups of people in America. Almost half of them have at least one part-time job. In fact, some even have three jobs and still manage to have high grades and go to school full-time. So Dr. Jason decided to make life a little easier and a lot cheaper for his students by writing his own book on public speaking. He thinks that many books have an increased price because of bells and whistles : CD-ROMs, lots of color photographs, and lots of graphics. He talked to his students, and many of them, like him, prefer to keep things . They want to have a book which is brief and concise, not long-winded. A few years ago Dr. Jason finished his own textbook. " Compared to most other public speaking primers(启蒙书), mine is half the number of pages, and one-third the price. That is, $ 30 instead of $ 90. Plus, it is published in a three-ring binder format. So, when I wrote a second edition last year, students only had to buy the 35 new pages and delete 35 of the original pages. For only $ 7.00, they had upgraded to the new edition. I’ ve had great feedback from my students about this loose-leaf concept. Maybe the word will get out, and more writers and publishers will try it," said Dr. Jason. Dr. Jason decided to help his students by______.