I’m trying to sell some medical supplies, but it is showing me for 0$. Is that because the station I am at does not need them?
You’re right, lack of demand could be a reason you’re unable to sell. You can check the right side of the terminal to see what they’re actively buying.
If there is demand and you still can’t sell, it could be a bug.
There are also some helpful community tools that document what stations are buying and selling, but I recommend taking their price data with a grain of salt: