For last 3 days I tried to understand reasons of lords remaining with 0 gold situation which happens at 1.3.0. It is not common but when happens it is so disturbing, lords even cannot buy food and starving. I was also expecting to prove Sturgians are suffering mostly as economical because their towns has very low prosperity compared others. However I see that Aserai suffers more as economical compared to Sturgia even they have several towns with high prosperity. Also Battanians were in a good economical situation in most games even their total number of towns and total prosperity is less than others even from Sturgia and Aserai. Then it was obvious total income is not mainly come from taxes. I was expecting 80% of npc clan's income comes from taxes but this ratio was lower it seems. Then I collect data from battle loots too in addition to taxes. Made a table all together. In the table it was clearly seen battle loots are so important for Npc clans. Long peace times (identified as blue rectangles in table) damage kingdom's economy because lords cannot get loots, in opposite in war times kingdom clans get rich (red rectangles). As you see at table a kingdom's income source mainly comes from tax from towns / castles / villages but it is only 60% was not 80% like I expect. Remaining 35% come from battles. About 5% others (prisoners, etc).
In table there is only one game 10 year run data. In that game Sturgia was not isolated much and joined lots of battles thats why their economy did not go bad. However in some gameplays Sturgians can be so isolated and they can have long peace times. This also damage their economy. Then if they go in war when their economy is not good they lose settlements because of weak garrisons. Also yes second reason is their tax income per fortification is least among all kingdoms. (in table it is not so obvious because they captured 1-2 extra towns)
By the way empire column for poor clan leaders (last 6 columns) is for all 3 empire factions. You can divide it to 3 to compare with others.
As conclusion, with a patch we will decrease loot income from battles (for only npcs, they get this income as gold instead of items for now, however there was no trade penalty applied, we will add that) by 50% and we will increase all tax incomes from settlements by 25%. This will make economy of kingdoms more stable, they will not need battles to save their economical balance, also player will get 25% better tax too. Current bonuses for Sturgia and Aserai can change in future they are not effective and these two factions should get some important bonus because they suffer from geographical positions also Sturgia has lowest prosperity and they get 30-40% less tax income compared average of others.
One addition : while examining all prosperities I see 3 Aserai castles start game with 0 prosperity. This is weird we did not notice it for 1 month. It will be also fixed with patch.
There are some reports also 1.3x cavalry bonus also damage Sturgia parties in simulations. Will also examine its effects on Sturgia's weakness and give report to teams added that constant.