The simple message is "Don't spend your money on things you don't really own, because you'll be at forever war with the lenders".
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I have no issues with the author mentioning the film, not the book. I was rather curious why not the book, but the film, solely because of this ‘wood’ story told in both. The author said they haven’t finished the book yet, so that’s fine with me. I just find it ironic they did not mention the book (and the author too), considering the story it tells.