What controls whether your colonies bother sending resources to eachother?
For example, I have two colonies that are both right next to each other, orbiting the same world. Here's their commodities summary.
Spoiler
(https://image.ibb.co/cC60kL/Untitled.png)
For whatever reason, only some resources are supplied between the colonies, and for the life of me i can't figure out why.
It's not a big deal, I'm super loving .9a, my OCD just wants everything to line up.