What is your policy towards your vassals economically? Do you just exploit them or do you give them gifts of money to build new improvements if you have extra money available?
Earlier I used the laissez faire policy towards my vassals. I just gathered money to have a lot money reserves available. I have changed my policy. I noticed that when your vassals have enough money they build new improvements for their provinces.
I think it is a good idea to support them if you have enough money available. This is possible later when your provinces improved and you make a annual healthy profit. In short term you lose money but in a long run your vassals provinces are have better economy and they are better fortified.
Earlier I used the laissez faire policy towards my vassals. I just gathered money to have a lot money reserves available. I have changed my policy. I noticed that when your vassals have enough money they build new improvements for their provinces.
I think it is a good idea to support them if you have enough money available. This is possible later when your provinces improved and you make a annual healthy profit. In short term you lose money but in a long run your vassals provinces are have better economy and they are better fortified.