Most of you are familiar with the concept of base tax. This permeates the game at so many fundamental levels, with everything from forcelimits to coring costs being coupled to this. We also had a value in a province that was called manpower. Trade-Goods produced was arcanely connected to the basetax, and there is not a single human being that could calculate how much manpower in a province actually
Now we have 3 separate values in a province called Base Tax, Base Production & Base Manpower.
Base Tax affects your monthly tax income as before, and also increases your defence against hostile spies.
Base Production impacts the amount of trade-goods produced in the province, and how quickly ships gets build in the province.
Each level of base manpower increased your nations maximum manpower by 250, and also impacts the garrison growth in the province, and how quickly regiments is recruited in that province.
All of them together is called “Development”, which describes how heavily populated and built up the province is. Each level of development increases the supply limit, forcelimits for your armies and navies and makes it harder to converts its religion.
Finally, the development level also allows you to be able to build more buildings in that province.
Wait?
What am I talking about here? Well, first of all, we have reduced the amount of possible buildings, as a large part were fillers. Secondly, we removed the power-cost for building buildings. And finally, not every province can have the same amount of buildings. Currently, a province can have 1 building as default, with some terrains like desert or mountains reducing it by 1, and some increasing it, like farmlands. And, every 10 development allows another building slot in a province. So Paris may be able to have 6 buildings in 1444, while Figuig can not support a single building.
Now you say that we haven’t really talked that much about wide versus tall, but bear with me.
You will be able to spend adm, dip or mil power to increase base tax, production and manpower respectively in a province, where of course the cost keep increasing, but if you dream about a 20 base tax Dublin, then you can do that

Doing this in deserts or arctic climate is far more expensive than doing it in better climates. The ideas that affected build power costs, now affects the cost of improving your province. There is also technologies that decrease the cost of improving development in the later half of the game.