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So I was mucking around with the BP of my kingdom in the kingmaker PC (34 by the way or 4 without the outside subsidies) for fun to see what that might translate to in real world profit. Anyway there's a number of problems here in trying to convert...
1) BP aren't a straight gold value they're labour and resources and so on.
2) GP to dollars are a major source of debate in and of themselves.
However them I stumbled across the economic concept of GDP per capita (purchasing power parity) and that's actually really low at 134,000 for the wealthiest mark on of earth Quatar, the U.S comes in at 64,000 and France at 40,000.
So that got me thinking BP is your kingdoms ability to build and structure things and roughly work out at a self rate of 2,000 GP.
So if you take your BP income as your countries PPP and multiply by 2,000 to get a dollar value could you compare them?
My fledgling kingdom has a GDP of 4 or 8,000 similar to Do Salvador. A more established one might have 30 or 40 which would 60,000 to 80,000. Wealthy little places yes enough to get onto the wealthiest countries in earth list but then again they do have a magical economy and for a more accurate comparison could have PnP expenses that don't exist in the game version (maintaining roads or the like).
Alternatively if I'm finding wrong BP values and established kingdoms are in the 100's or 1,000's of BP per income phase you can always look at nominal GDP and multiply by purchase price (4,000) rather than sale price (2,000) and maybe even the general gp to dollar value I've seen in a few places of 1:20 (though given the debate on gp value I'd rather avoid this). Perhaps convert mideval pound to modern pound instead if you feel compelled to make your country rich?
This would give my kingdom a GDP of 4 x 4,000 = 16,000. Which is pretty sad but it's a new, small kingdom. Somewhere with a BP income of 100 would have a GDP of 400,000, again this is working with the kingmaker kingdoms which are really small and 400,000 is similar to Norway (US has a nominal GDP of 21 million based on my searches).
So what do people think could this work to get a rough idea of how wealthy your kingdom is in modern terms?
If you have used kingdom rules I'd appreciate some values/size ifbyiur willing to share them.