Don't forget the entry in this website about Cargo Holds As mentioned below, if you want to play around with interstellar trading, or even try doing a full simulation (to do worldbuilding for creating the background of your new novel), I'd suggest getting a copy of GURPS Traveller: Far Trader.

Written with help from a real live economist, this allows one to model interplanetary and interstellar trade with equations and everything.

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You'd probably be better off reading the full article but some people want executive summaries.

Rick starts with certain assumptions and follows them to various conclusions about the interstellar economy.

With creative maintenance, the service life might be longer than 30 years, see below.

Question: how many cargos can a merchant starship carry in 1 year?

The leader of the thalassocrats is of course called the thalassiarch.

Men, my brothers, men the workers, ever reaping something new: That which they have done but earnest of the things that they shall do: For I dipt into the future, far as human eye could see, Saw the Vision of the world, and all the wonder that would be; Saw the heavens fill with commerce, argosies of magic sails, Pilots of the purple twilight dropping down with costly bales; This section is basically a rough outline of Rick Robinson's Interstellar Trade: A Primer.

In the 15 years since Danny’s death, the list of murdered journalists has grown long.

This is how he died, losing his life in an effort to nail down a story.

Sometimes these trader cultures in large clan-ships have a Thalassocracy, where they have a monopoly on trade since they control all access to space.

If people living on planets want to engage in interstellar trade, they have to go through the thalassocrats.

Therefore it costs 0,000 per ton of cargo capacity per year to run a cargo starship.