The maximum possible wealth of the Earth?

A question from Yahoo! Answers:

What is the maximum possible wealth of the Earth (i.e how much money can u make from the Earth’s resources?

The question is misguided. The vast majority of wealth is produced by human labor and has relatively little to do with Earth’s resources. About 70% of what any industrialized nation consumes today is services, and this proportion has been steadily increasing over time…

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