Trade Routes - Exactly how do they work?

[zentuit]

Its a good question Haido. I'm going to be looking at this more as I can. I have a suspicion that in the settlement detail screen when you see the trade (and corruption) icons fading in and out it means that trade is interdicted somewhere. I believe some trade gets through.

[Soulflame]

I thought the fading icons were the "maybe extra" [income/destruction/whatever], and the static ones the "minimum" [income/destruction/whatever].

Can't find it in the manual (just says "it is detailed on that screen" on p29/30, with no additinal info)