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SpaceX (another of Elon Musk's companies) has achieved similar feats in the realm of space flight.

According to his biography <https://www.amazon.com/Elon-Musk-SpaceX-Fantastic-Future/dp/..., Musk is particularly good at identifying supply-chain components that can be economically produced in-house. The Gigafactory looks like the same general strategy, and if it pays off as well as the SpaceX case has, they have a good chance of achieving their production goals.

What happens when he starts combining companies?

Space X launches the rocket that takes solar-powered self-driving machinery to Mars which starts building solar-powered settlements. By the time we get there, we're not fighting for basic survival, we're just moving in...

Most supply-chain components can be economically produced in-house. You just need the capital to build a 5B factory, which is a whole different kind of problem in my opinion.

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