Quote Originally Posted by King Henry V
Can you get money from trade between 2 provinces you own?

Yes, possibly, maybe, although I can't be sure.....

When you click on the money symbol and the click on a province with trade goods, it will bring up a 2nd parchment on the left side of the screen. This 2nd parchment will give a breakdown of trade income from the various provinces belonging to other factions. At the top of that parchment, you'll see the income you're getting from "local trade".

At first, the income from local trade will only reflect trade within that province itself. Now I can't be certain (as I have no idea what the numbers encoded into the game are), but it does seem as if the more provinces that province touches, the higher that province's Local Trade income goes up. I think it increases even more if it's connected to other provinces with trade goods (and those other provinces have built a Trading Post, Merchant, etc. as well).

Ultimately, however, it doesn't really matter if my surmise is correct or not. In the end, maxing out the trade income in all your provinces (even the landlocked ones) is never a bad thing--they usually pay for themselves in a relatively short period of time.