What is the total worth of all assets on Earth?

The United States has a gross domestic product of roughly 11 trillion dollars. As a guess, the total worth of all assets in the United States is rough 110 trillion, and that of the entire world roughly 1 quadrillion dollars. In other words, if an alien race came and offered to buy Earth piecewise, would 1... show more The United States has a gross domestic product of roughly 11 trillion dollars. As a guess, the total worth of all assets in the United States is rough 110 trillion, and that of the entire world roughly 1 quadrillion dollars. In other words, if an alien race came and offered to buy Earth piecewise, would 1 quadrillion dollars be a reasonable total for everything, if nobody knew that they were going to buy the entire planet? Can you find a way to estimate the true total worth of all assets on Earth, as owned privately and publicly?
Update: And please spare me talk about how priceless this planet is. The reality is that everything on this planet is legally owned by one entity or other, and have a price on them, even if only for tax reasons.
Update 2: Note: 1 quadrillion dollars is the same as 1 petadollars, or 10^15 dollars. See wiki chart.

http://en.wikipedia.org/wiki/Peta-
Update 3: Jade, you forget that a lot of assets are owned by sovereignties, not just individuals.
Update 4: I would like an estimate within 1 order of magnitude, such as "10 quadrillion dollars", or "100 quadrillion dollars". At 100 quadrillion dollars (10^17), that would come to about 10 million dollars for every person in the world. Can it be that high?
Update 5: is it 5 yet?, forget about the aliens, at least you are thinking, and you seem to be coming around to a figure between 100 trillion and 1 quadrillion dollars, even though you haven't proposed a figure.
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