With SpaceX shares soaring 20 percent on their first day of trading, the world’s richest person crossed another milestone — one with 13 digits.

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SpaceX’s trading debut is expected to smash records. Wall Street is watching to see what else it disrupts.

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The previous record was set over six years ago. But SpaceX, whose stock begins trading on Friday, is on track to raise tens of billions of dollars more.

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The SpaceX I.P.O. will enable its founder to build — and scale — his peculiar vision of society.

Two Times tech reporters and their editor talk about assessing the sky-high valuation of the rocket and satellite maker, the potential economic impact of its public debut and the role of the world’s richest man in it all.

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