One of the memes of SF RPGs that is very popular is the Tramp Spaceship model - the group of PCs who own/crew a spaceship which travels from world to world, picking up cargo here and selling cargo there. This is one of the memes I want to support in SC 3E, yet it seems incompatible with the economic future as envisioned in SC 2E - that all things being equal, one does not ship in from another system what one can make in-system. The reason you buy something is that it is perceived as being better and/or cheaper than the alternatives - it is either one, the other, or both.
If you are transporting something from out of the system, the product is very unlikely to be cheaper than what is manufactured in-system, so it has to be better to compete. Your friend here is the Tech Level difference. If you have a positive TL difference between the source and the highest TL in-system, you are selling goods that cannot be made in the same manner in this system, and thus may undercut the price and/or quality of goods in-system. If you have a negative TL difference between the source and the lowest TL in-system, you need too be selling something which is not made at all - handicrafts, unique objects, and the like. There are some items which can be sold regardless of tech level - artwork, gourmet foods and drink, and much Intellectual Property, for example.
So I have to work out a commercial system for SC 3E which can take all of the above into account. It also must use the Wealth system rather than credits, like IHW:SC, and unlike SC 2E. What I'm thinking is using the group rules I developed for IHW:Wild Blue and extended in OHMAS as a basis for this. The group creates a company, and the company prospers or not. The PCs earn paychecks from the company. The company owns the ship, and buys and sells merchandise. I like this! It's simple, logical, and extensible.