Thanks to you Mechan, for compiling this much-needed document! Despite the advice in this document to not mix economies, I'm really curious about the influence of multiple economies in the same system. How to calculate the rate of cannibalization among them? What about boosts among them? There's anecdotal evidence, for instance, that putting an extraction facility on the same Rocky planet w/ a Refinery Hub will actually boost Refinery output. Is that true? How to calculate the effect? Also, if weak links are an order of magnitude weaker than strong links, how badly do economies on other planets in the same system really muck up the output of economies at other planets in the system? Wouldn't those "pollutants" be rather insignificant? This might, for instance, enable a Refinery planet to coexist in a system with a High-Tech planet, assuming each has a Port to soak up its local merchandise. That, in turn, would improve the tech level of the system overall. Much more research needed by the community here, IMHO.