From the information that I have been told by other testers, there seems to be a limited amount of gold sinks in game. What I mean by a gold sink is a system that takes currency and flushes it down the proverbial "drain". In essence it takes that money completely out of circulation.
To my knowledge there is only 1 such system that does this and that is taxes. Apparently the harbors only transfer the paid money from use to the governor's pockets. Which makes it a capital gain and not a gold sink. Maybe change this to a gold sink as well to help.
I would love this game to have many more gold sinks in other forms than taxes. This will help stabilize the economy and keep the value of goods and commodities at a reasonable value. Otherwise I fear there will be millions of gold in circulation within a few months of the games launch.
Possible options could be rare highly costly housing upgrades like furniture, rare house deeds, statues, armor/weapon skins, mount skins etc.
I am sure many other ideas could be made that I am not thinking of.