4.0

This was a really interesting read. I'm not sure I agree with all of Friedman's conclusions, but it will be interesting to wait and see what happens. This book was published in early 2009, so I'd be interested to see if Friedman would make any changes due to the largely unforeseen events of 2016/2017. I listened to the audio book, but I would like to buy a hard copy to refer back to on occasion.