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Title: Good concept, mediocre execution
Review: The idea of a Number specifying how much you need to accumulate to retire safely and comfortably is smart. However, the author wanders from topic to topic, story to story, and when you're 80% done with the book you start wondering if the author actually has any answers. Unfortunately, he doesn't. All the discussion is minorly interesting, but not really educational and it doesn't do much to support your quest for a Number. I ended up with a post-it note with some things to investigate more after finishing the book, but that's it.
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