I am suggesting to add some unique items and/or limited edition items to encourage the need for money in the game. As of now, there is no reason to want more silver at later stages of the game and this alone is sufficient to kill any economic system. This idea is similar to one already posted (viewtopic.php?f=12&t=2416). The main difference is that the idea I am proposing now has 2 functions. The first one, is that I want it to be a big money sink that would therefore make people want a lot of money. The second one has to do with later game dynamics where any unique or limited edition items would be sought for and a rivality could emerge to own these items. Since they would require a lot of silver (They could be auctionned at Boston too), only town owners would likely have enough money to purchase them, put them in their town hall (viewtopic.php?f=12&t=3063) and provide enough protection.
These items could give small buffs to citizens of a town. You could have something like the original copy of Newton's book (gives +10% bonus to inspirationals studied), Adam's smith book (Lower upkeep), a war trophy... Some items (architecture plans) could unlock the ability to build a special building (costs upkeep), well anything that you can imagine and that would be cool in the setting of Salem. The little buffs are necessary so that people would be willing to spend this money and the town owner would be happy with it since it would likely increase player traffic in his town, further boosting his earnings.
Please show your support if you find the ideas interesting and you think that their implementation would improve Salem. I will answer any question you may have to my best and thanks for reading.