Re: My mostly hard sci-fi campaign
Here's a rough idea of the economics of the solar system:
Earth: imports raw ore and some finished products; exports food, water, metal, wood, plastic
Moon: imports metal, plastic and wood; exports helium-3
Lagrange Points: import raw materials, export finished products (hardware, spacecraft, etc.)
Mercury: imports air, food, water; exports finished products (mostly data from scientific projects)
Venus: imports air, food, water; exports finished products (hardware)
Mars: imports minerals; exports iron, hardware
Asteroids: import air, food, water; export ore and minerals
Jupiter's moons: import food, metal, plastic, wood; export water, ice, minerals from Trojans
Saturn's moons: import food, metal, water; export minerals, helium-3 mined from Saturn