It's because of the ease of audio book that has made more book titles to now have both formats -- the audio book and physical book formats. On a closer look you will notice that one saves a huge amount of time "listening" to a book while driving than the hours that would have been spent seated in one spot reading a book. Audio books now help many people that want to gain knowledge but don't have the time to spend studying. It's not surprising that many people -- children, adults and the oldies -- now prefer to listen to audio books rather than read.

Audio books are much more cost effective in terms of production than other paperbacks and hardcover books; this is a big extra advantage audio books have. Audio books also help to conserve nature than hardcover and paperbacks; another big advantage.