Using the Budget screen, you can do a few quick calculations to figure out the GDP of your country. This is the income approach to assessing GDP, measuring the income of all pops engaged in the economy plus gold income less any government spending on pops. This is different from the Expenditure approach to GDP, the standard (C + G + I + MX), but they are two sides of the same coin.
The total income of pops is the taxes paid/effective tax rate. Since (income*effective tax rate = taxes paid). I have found that the accuracy of this is iron tight, only rounding errors causes disparity between income calculated and income observed.
The methods below are all trying to isolate the income generated from the producing pops. From RGO, artisan and industrial production.
The simplest method of GDP measurement is the summed income of all Capitalist, Clerks, Craftsmen, Artisans, Aristocrats, Farmers and Labourers (slaves or serfs too) plus gold income.
So here is the GDP of Belgium at the start of the game from the budget above. Multiplying by 365 the figure for that day you can extrapolate an annual GDP figure.
If unemployment subsides and/or Industrial subsidies exist, you will need to subtract theses figure from the above calculation. (Unemployment is only paid to clerks, craftsmen, farmers and laborers.)
If Pensions exists you need to calculate the income of all pops, then subtract all education, administration, social and military spending. You do this because some portion of the producing pop’s income will be pensions from the government which don’t contribute to GDP, but it’s difficult to know the amount paid to each.
This is only if administration efficiency is 100%, since amount of money that goes to the respective pops from administration, bureaucracy and military spending is somehow related to administration efficiency. You could still calculate GDP, when AE<100%, if you knew how AE was related to these spending. I think it is a formula like Slider spending = pop pay*(2-AE), however I am not totally sure.
Here are the calculations for a late game France, from budget above, when you need to cancel out pensions in the GDP calculation.
Negative tariffs are another item that if a country is running them, they probably should be subtracted from the GDP calculation, since they act as subsidies to industry and as a sort of payment to pops.
It would be cool to make a script that would read through a save game file and output this information for every country. I think it is possible, but my scripting skills so far are nil.
edit to fix images
The total income of pops is the taxes paid/effective tax rate. Since (income*effective tax rate = taxes paid). I have found that the accuracy of this is iron tight, only rounding errors causes disparity between income calculated and income observed.
The methods below are all trying to isolate the income generated from the producing pops. From RGO, artisan and industrial production.
The simplest method of GDP measurement is the summed income of all Capitalist, Clerks, Craftsmen, Artisans, Aristocrats, Farmers and Labourers (slaves or serfs too) plus gold income.
So here is the GDP of Belgium at the start of the game from the budget above. Multiplying by 365 the figure for that day you can extrapolate an annual GDP figure.
If unemployment subsides and/or Industrial subsidies exist, you will need to subtract theses figure from the above calculation. (Unemployment is only paid to clerks, craftsmen, farmers and laborers.)
If Pensions exists you need to calculate the income of all pops, then subtract all education, administration, social and military spending. You do this because some portion of the producing pop’s income will be pensions from the government which don’t contribute to GDP, but it’s difficult to know the amount paid to each.
This is only if administration efficiency is 100%, since amount of money that goes to the respective pops from administration, bureaucracy and military spending is somehow related to administration efficiency. You could still calculate GDP, when AE<100%, if you knew how AE was related to these spending. I think it is a formula like Slider spending = pop pay*(2-AE), however I am not totally sure.
Here are the calculations for a late game France, from budget above, when you need to cancel out pensions in the GDP calculation.
Negative tariffs are another item that if a country is running them, they probably should be subtracted from the GDP calculation, since they act as subsidies to industry and as a sort of payment to pops.
It would be cool to make a script that would read through a save game file and output this information for every country. I think it is possible, but my scripting skills so far are nil.
edit to fix images
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