Why have products that show up but never can build

gov facilities and no Sc maintain. I pretty these are green supply corp types. Forts and and carriers are always green. These you dont want along with heavy tank ammo and heavy arty ammo. I have 3 slave countries and I never use heavy tanks or heavy arty. If you see any of these get rid of

You can sell them to me if you think they are so worthless....

Send to Aurelantis on FB, Oak Island on TA, or Hymy Beach on KB.

so like someone would actually buy up heavy tank ammo in space

I use a lot of both heavy tank and artillery ammo.

In general it is more expensive in space.
some players are not aware of that.

some products are in a severe short supply.
space trading can make sense.