Merchantilism + representation + liberty statues = holy 2 free specialist in each city with at least 6 science point in each city from representation bonus
Merchantilism + representation + caste system + black library + liberty statue = ultimate specialis fanatic
i actually like the first combo than free trade
sure u could earn abit more with free trade, but that combo garrantees 6 science points from each city, regardless of what kind of specialist.
so u can balance out your city, for example, your city lacks production, u can get 2 free engineer with 6 science point(ofcos u need to buildings requred)
by adopting merchantilism, other civ will not have trade route to your cities. city trading is bothways, if u look at your cities, you will notice that in city A, it says trading with city B, and in city B, you see its trading with city A.