When I was building my resource tiles, I noticed, that even tho I had all of them on level 7... the production wasn't same, thanks to bonuses from structures, season, spell... and I was thinking... what if someone doesn't use clay too much? It just stands there, fills the storage and he has nowhere to ship it...
So I came up with an idea (and I know that developers probably will hate the idea thanks to it's complexity to make it working) to adjust tax rate individually to the 4 different basic resources. If I got my storage full of iron, put 100% tax on iron and the resource increase from that branch is gonna be minimal.
Instead of having just one bar with 'how much tax' and it would affect everything, 4 separate bars which would affect the specific basic resource and income of the city. I think it could help at least some people in equalizing their productivity of resources or just simply putting lesser tax on resource they really need.
Thanks for reading.