I call bullshit on that book. I've never worked anywhere that kept people on just for the sake of it. Sure there might have been people who probably should have been fired, but the job they performed wasn't fake.
So his thoroughly-researched book, that he spent years working on, and based on thousands of individuals submitting their experiences, is completely bogus because.... you haven't had the experience that millions of others absolutely have?
Sure pal. All jobs are totally important and not at all pointless, wasteful make-work.
