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Eco Stats Mod

The GDP[en.wikipedia.org] will show you the size of the city's economy.

The GDP per capita is the size of the economy divided by the population amount (often used as an indicator for the wealth of individuals in a region, although not considered by some to be so).

The Residential GINI[en.wikipedia.org] is an indicator ranging between 0 and 1 that attempts to measure the difference in wealth for each citizen (0 means all are equally wealthy, while 1 means one citizen owns everything and the rest nothing).

The City Value per capita is analogous to GDP per capita (kinda...), it is the city value divided by the population amount.

Government spending to GDP[en.wikipedia.org] tells you how "big" government is, or how much it spends compared to private spending. If, for example, you raise taxes and spend much more, then government spending to GDP will be much bigger, and private spending smaller. (It's about how much you spend not how much you take in taxes, since GDP takes in the amount of spending not the amount you as the "government" take in). The less you spend and tax the more private citizens have available for spending.


GDP: Calculates and shows GDP, as well as Per Capita GDP, and Government and Private Spending per GDP. GDP Is calculated based on total government expenses (without loans), and assumes that non taxed private income is spent fully by citizens and organizations (industries, commercial entities, and offices).

GINI: Residential GINI is calculated by counting each citizen's residential home building level, and passing it through the standard GINI Function.

City Value per Capita: Calculates the City Value per Capita, and the City Value per Capita w/o Savings (meaning, without the money stored in the city's bank account)

The Project and source code on github is right here[github.com] for anyone to see and collaborate.


The formula for GDP is GDP = C + G + I + (E - M) where
C = Total sum of consumption
G = Total government spending
I = Total amount of investment
(E - M) = Net Exports (Amount of exports in $ - Amount of imports in $)

In Cities Skylines, government spending and investment are calculated as the total expenses minus loan payments (since that does not count for GDP in the real-world formula). "Expenses" in education could be considered investment instead of government spending, but it all gets added to GDP.

To calculate the total sum of consumption, we assume every private unit, whether residential, commercial, or industrial, spends their money in full (doesn't save anything), because we have no way of knowing if they keep anything in a bank account or not. We calculate their spending based on the amount that is not taxed by the government. If taxation is 9%, for low residential level, for example, then the amount of low residential income that is spent is 91% (100% - 9%). Now, we know that by taxing low residential units, we get 'x' amount of money, and that equates to 9%, so we simply solve 'y' for 91% through simple cross-multiplication. We repeat the process for low and high density, and for residential, commercial, and industrial. We add them all up and get a combined amount of consumption + investment, which all adds up to GDP.

There's only a limitation on the part of the mod developer (me) with respect to calculating total export and import amounts, so that the net value is added to GDP. This limitation is due to the fact that I have not yet figured out how to get that from the API of Cities Skylines (the Modding Application Programming Interface of Cities Skylines). As soon as I'm able to figure it out, I will add it to the mod.

After all this is added up, we get the final GDP value. GDP per capita is self-explanatory (GDP / total population).

GINI is a measure of statistical dispersion that outputs a result between 0 and 1.
We create a collection or list of the building level that each citizen lives in.
It loops through every citizen and checks the house's building level, then adds it up to the collection.
After the looping is finished, we pass those numbers in the collection through a function you can find here[en.wikipedia.org]