Week 14 Reading reflection

The thing that surprised me the most was the part about innovation and how much has to go into making it happen. I thought it was really interesting.
The thing that confused me the most was the part about exit strategy because I don't really understand how you know when to exit and when you decide to not continue fighting for your business.
What is the prime time to exit a business and how do you know you are there? What's the key difference between middle managers and first line managers?
I do not disagree with anything the author said.