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You can alter some of the assumptions yourself to tweak the economy to suit your science fictional background.

Merchant Starship Costs Assumption: starships in the interstellar empire are equivalent to present-day jet airliners.

It has detailed analysis of the economics of interstellar trade, and a system of equations to model trade routes and economic demands.Sometimes the traders live in large "clan-ships", developing a "trader culture." Each ship is a world, carrying the entire clan. Novels including this include CITIZEN OF THE GALAXY by Robert Heinlein, STAR WAYS aka THE PEREGRINE by Poul Anderson, the Cities in Flight novels of James Blish, MERCHANTER'S LUCK and FINITY'S END by C. Cherryh, RITE OF PASSAGE by Alexi Panshin, A DEEPNESS IN THE SKY by Vernor Vinge.Assumption, average of 1/2 of retail price goes to shipping cost.Therefore the minimum price of interstellar imported goods are 0 per kilogram.Assumption: starship fuel is cheaper than cargo jet JP-4 fuel.

Big assumption since JP-4 is about

Big assumption since JP-4 is about $1.39 per gallon.(ed note: starships are going to require lots of infrastructure.)Assumption: the service life of a merchant starship is 30 years.This means the ship owner must earn $100,000 of profit per ton of cargo.That is, selling price at destination MINUS purchase price at origin must be $100,000 or more.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.Therefore it costs $300,000 per ton of cargo capacity per year to run a cargo starship.

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Big assumption since JP-4 is about $1.39 per gallon.(ed note: starships are going to require lots of infrastructure.)Assumption: the service life of a merchant starship is 30 years.

This means the ship owner must earn $100,000 of profit per ton of cargo.

That is, selling price at destination MINUS purchase price at origin must be $100,000 or more.

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.

Therefore it costs $300,000 per ton of cargo capacity per year to run a cargo starship.

.39 per gallon.(ed note: starships are going to require lots of infrastructure.)Assumption: the service life of a merchant starship is 30 years.

This means the ship owner must earn 0,000 of profit per ton of cargo.

That is, selling price at destination MINUS purchase price at origin must be 0,000 or more.

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.

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