Thanks for responding. I understand that. I put the module on a planet's own starbase. The zone of influence clearly covered the planet in question...that's why I built it there. When I followed the trade route line from the originating world, to the trade partner, it clearly ran through this other world's starbase. I added the trade module and saw no additional revenue. Not in my govern screen, or on the starbases itself. Any ideas?

Thank you Joe, although I wish the answer were different. 

That is correct. I was hoping it would add to the route if you built Econ bases along the route. 

Thats a good concept, but yeah, not design intent. Hopefully that idea would be considered in a future economy/government DLC.