I was under the impression that if a freighter (or trade route) passed through an economic starbase's area of effect, and if that starbase had say +30% for trade, that trade route would get +30% in income regardless of how many other starbases it passed through.
Reading some other posts though, people seem to think that building more starbases (and upgrading them) along the route will stack this effect. So if you had two +30% starbases along the route, you'd get a total of +60%? Is this true? How exactly does this bonus work and when does it apply?
Thanks!