Gol per hour creation

Hi Guys i have tried looking via search but only get gold mark results and read manual but nothing helpful there.

what i am after is what helps to produce more actual gold in the game.

ppl say build harbours but how much is that going to increase it by?

does anyone know how much gold your better off by which building?

I know moral factors in but how much?

i have a game that all cities of my 20 regions as Philippines have harbours and factorys and half have railways and all 10 % but i only get 2k gold per hour. in another game as greece i have 6k per hour and less harbours but more factory's but same region count.

so that is a big change in gold production that i would like to know what factors in it to increase it

thanks