It would make a lot of sense, if output exchange prices were higher if many people are exchanging stone for wood etc.

Let’s say for each 500 stone selled, 10% is going to some kind of pot, so it’s 50 stone. If pot will reach current required stone amount to exchange it for wood, the stone amount required should be increased by let’s say 5%.

Example:

https://www.basic-mathematics.com/supply-and-demand.html

It will create basic economy in the game