I am playing civilization bts for over 1 week. It's better than wanila, but i noticed one really bad thing - there is no need building the cities because it produce no money!!! Now I am about at 1500 AD, and most civilizations(and me) are technological advanced as it was in the real life(the astronomy is researched, nationalism, guilds etc.). But I don't understand - the cities produce no commerce, but I have got gold mines(in working city radius), many hamlets, villages. Why it is so? I've built also market, it does nothing
. What I need to do? Maybe to research banking which enables mercantilism(i guess) ?
P.S. In the city meniu I see that commerce is zero, and i can't raise it or decrease.

P.S. In the city meniu I see that commerce is zero, and i can't raise it or decrease.