What's One Business Book That You've Read?

There was a guy that came and talked to us. He said, if you've kind of lose yourself in an activity and you kind of ask, you're like, Oh, where'd the time go? You've probably were in the meditative state That's one business book or not? I don't want to limit it. The concept of TOC or theory of constraints is unbelievably applicable to so many parts of business and life. And I just kind of hop in, read a story and start thinking about it.