What exactly are the colony systems shipping back to Sol system to pay off their trade deficit in intellectual property such as entertainment, scientific development, and R&D?
https://www.reddit.com/r/IsaacArthur/ keeps saying metals, but starlifting Sol would be astronomically less expensive.
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Exotic biologicals.
Earth's ecosystem can't produce Altair Star Coffee any more than Altair's can produce Jamaica Blue Mountain, but so long as there are obnoxious coffee snobs among the wealthy classes, The Beans Will Flow.
Also the spice(s).
