One rule: new coins only enter through the decree. Each day the decree allows 2,000 pennies per active player, shrinking as the town's money supply nears 20,000 pennies (200 ducats) per active player. It's split between houses (mint presses, 65 %), the Merchant (20 %) and found money (mob drops, chest loot, appraisals, 15 %). With an outside trader such as Plantations installed, 10 % of it is the street share that trader pays out from, and the houses keep 55 %.

Money per player, 90 days

Money supply per player, 12 players minting 60 % of what the decree allows. Sinks: 2 % market duty on sales, 1 % on bank transfers, the Banker, the arts, Doge's medals.

Scenarios

scenario	what	day 7	day 30	day 90 (of target)
casual	5 players, use 40 % of the refill	4,640 p (23%)	12,812 p (64%)	17,253 p (86%)
server	12 players, 60 %	6,701 p (34%)	15,719 p (79%)	18,323 p (92%)
big	40 players, 60 %	6,701 p (34%)	15,719 p (79%)	18,323 p (92%)
greedy	12 players mint every penny the decree allows (unlimited gold)	10,109 p (51%)	18,269 p (91%)	19,028 p (95%)
mob_farm	as greedy; mob farms add nothing (spawner/fake-player kills don't pay)	10,109 p (51%)	18,269 p (91%)	19,028 p (95%)
inactive	30 registered, 4 active: the target follows active players only	6,701 p (34%)	15,719 p (79%)	18,323 p (92%)
street	as server, with an outside trader (Plantations): pays out its whole share daily, 60 % comes back to its purse	6,559 p (33%)	15,484 p (77%)	18,255 p (91%)
street_greedy	as greedy, with the same trader	9,678 p (48%)	18,033 p (90%)	18,949 p (95%)

Supply per player doesn't depend on how many play, and unlimited gold doesn't break it. Mob farms add nothing: only player kills of mobs that spawned on their own pay. The one lever for a server admin is targetPerPlayer.