(automatically translated text from French, sorry if some wording is strange)

Currently, I can sell as much stone as I want to a merchant, as long as he has enough money. I think this is a flaw. With enough work time, money flows freely for some resources.

This problem can be mitigated by my other suggestion of broken tools (My suggestions: https://gtm.steamproxy.vip/app/1700870/discussions/0/4635988976587550731/) but we can add a "realistic" economy.
By "realistic" I mean that we can't flood the market with a product without lowering the price.

I am aware that this is difficult to balance, and that the developers are more competent than me. They probably even thought of it before me.

Two possibilities:
1- Simple: a merchant buys a limited quantity of each resource. Either a fixed quantity or in proportion to his money. Example: a merchant does not spend more than 20% of his money on a single resource.

2- Complex: the more a resource is sold, the more its price decreases among all merchants. Over time, the price returns to a normal value.

The interest is to push the player to a varied production. He will also have to be provident: selling a little regularly will be more interesting than selling a lot at once. The one who plays "day by day" will be penalized, the one who plans will have a more stable game.

Additional suggestion:
With such an economy, events can be added: the price of a certain resource increases or decreases this year (or the quantity that can be sold increases). The player will then be able to change his production year by year to adapt. The kingdom builds a castle, it is a good year to sell stone! A quarry has been built, the price of stone decreases this year!