Manna is a mildly entertaining story, and a completely unworkable idea. Post-scarcity economies are nice to think about, but they don't solve all of humanity's problems. A lot of them, yes, but not all. Manna would have been better if it acknowledged this.
"Live Your Life means that you are able get the most out of your life, as opposed to the least. Instead of dying in Terrafoam, or dying in some job that you hate, you live your life in the Australia Project in freedom and prosperity. Live Your Life means that you are in control -- again, the emphasis on freedom of choice. You decide what you want to do, and then you are able to do it. You reach your full potential. Live Your Life is the idea of thinking about your life as a whole, as something that you get to design and control. Does that make sense?"
That being said, it is nice to sometimes read something just for the sake of daydreaming about a nicer world -completely unworkable like you said- but entertaining nonetheless.
PS: Read also "Manna".