How to increase tariffs

[Thrake]

I mean, out of explicit ways - decisions, ideas.

Is it based on trade income, or production efficiency? Or none? Ie, what buildings will increase the local tariff (I guess the economical ones will increase the demand, and so indirectly, the tariff, but if it is only this, this merely goes down in the priority list.

Now I'm at it, same for gold mines (mainland AND colonial); my guess is none make a change.

 

[Dauth]

Viceroys is +33% I think.

 

[imperium3]

I was given to understand that production income is hidden in the tariffs, so any buildings that increase production income in the province will increase the tariff instead?

 

[Thrake]

Viceroys is +33% I think.

Well, I think it falls under "ideas". Thanks, but that's one of the obvious ways, as well as could be policies, advisor or wathever.

If production, then I guess that trade would also work, too, since it is the way how it goes in non colonial provinces (prodution derives from modified trade good price).