A bit tired of the investment pool discussion so time to speculate about other features we know nothing about 
Something thats been shown in a few screenshots and mentioned in the "Everything we know so far" Reddit post, is that the max number of inter-market trade routes you can have is determined by the economic system. Whilst this is probably a fine system, it seems a shame that its so fixed. For instance the ability to pass a law say that would increase/decrease number of trade routes, this then opens the mechanic up to all the interactions with interest groups that may desire more or less trade. Furthermore, the ability to rule by decree a little and use authority to permit another trade route seems an appropriate use of the capacities system, and could create interesting dynamics, (along with all the consequences of low authority). It seems that the interest group system would be capable of handling these sort of interactions in a believable way, and doing so would create more dynamic economic systems, rather than just a handful of fixed rule sets that was in Vic2 and seems to be coming in Vic3.
Tbf this is all speculation so maybe this is exactly how it'll work, or potential content for a DLC, who knows.
Something thats been shown in a few screenshots and mentioned in the "Everything we know so far" Reddit post, is that the max number of inter-market trade routes you can have is determined by the economic system. Whilst this is probably a fine system, it seems a shame that its so fixed. For instance the ability to pass a law say that would increase/decrease number of trade routes, this then opens the mechanic up to all the interactions with interest groups that may desire more or less trade. Furthermore, the ability to rule by decree a little and use authority to permit another trade route seems an appropriate use of the capacities system, and could create interesting dynamics, (along with all the consequences of low authority). It seems that the interest group system would be capable of handling these sort of interactions in a believable way, and doing so would create more dynamic economic systems, rather than just a handful of fixed rule sets that was in Vic2 and seems to be coming in Vic3.
Tbf this is all speculation so maybe this is exactly how it'll work, or potential content for a DLC, who knows.
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