how many cities do you have, maybe you haven't reached your maximum number of cities yet? Plus the bonuses to commerce only occur when you have cities and/or metropolises.
as Soren stated the commercial trait is really a late-game trait.
as Soren stated the commercial trait is really a late-game trait.

. My reputation sank like a rock... Tech trading became very hard. I soon found myself easily an age behind in tech race (ancient<--->middle ages). Still at great costs (military and gold) i got my realm expanded quite a bit to a solid 30 city empire (normal map). Then i could finally beat them in tech race, with the help of some espionage and some tech brokering (reputation was a little better by then). I was playing with the Persians, and those cheap library's and universities really helped big time. I don't think I'd pulled this of with let's say the Americans...
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just got a whole lot stronger too on non-pangea. With astronomy so many turns further away, the ability to establish colonial dominance of remote islands is enhanced, as is the benefit of enjoying exclusive trade and communications options with over-seas civs.
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