I'm in agreement with Sinner here.

Reason being "trader", "roads", "port" and "farms" are only the lowest building in the corresponding upgrade tree. Respectively, the upgrade trees are "market", "hinterland_roads", "port_buildings" and "hinterland_farms".

Therefore, I'm not sure how this factors into the calculations and reasoning here? For instance, what happens when the "> ______" no longer becomes relevant, e.g. for "> trader" and the trader becomes a market, forum, great_forum or curia?