How much money/valuables each kingdom produce annualy? As in a lord paramount’s yearly budget, and what they could save up every average year, since winter years are probs sinkholes moneywise and in the north I can even see complete economic halt. The russian tzars wealth came in huge parts from the fur of Siberia, erratic winters should make it even more valuable, no?

I estimate that the GDI of Westeros is somewhere around 525 million dragons a year. Dividing that by the population of the Seven Kingdoms, you get an extremely rough estimate of something like:

• the North: GDI of 46 million a year.
• the Vale: GDI of 40 million a year.
• Dorne: GDI of 20 million a year.
• the Crownlands: GDI of 20 million a year.
• the Stormlands: GDI of 33 million a year.
• the Westerlands: GDI of 59 million a year.
• the Reach: GDI of 131 million a year.
• Iron Islands: GDI of 13-20 million a year. 
• the Riverlands: GDI of 26-57 million a year.

Now, these are very crude breakdowns of national GDI by population, which leaves out that these regions have very different rates of GDI per capita. The North should be somewhat lower than its numbers suggest due to the poorer quality of the soil and the toll of the winters, Dorne somewhat richer due to its high-quality textiles, the Westerlands much much more due to their gold and their industry, and the Riverlands is a big question mark given that it’s population and army size don’t really match up.