Very Very very long. While everything in this audio book was good, all, or nearly all, was repated from what I had learned in my week at "Rothbard University" If you want an introduction to Economics, this is far too much. If you want an audio book, this is probably too long for it to be of use, if you want a reference as to why free markets work, this is a good one. returnreturnAs usual I again recommend purchasing the dead tree version, but cannot recommend the audio book with only 3 stars.