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For example, In the classical game Simcity

• an economic model to simulate the supply and demand of the city, then calculate how many people live in this building, how many people works here...
• an traffic model to simulate the commute time of the citizens,
• in another game, say there's a whole stock market, player and sim-citizens can buy and sell...

obviously, we cannot simulate every single citizen, every single car, every single trader in the market, we need some math modules and formulas

I'm making a fake simcity now and almost finished the graphics parts,
now I want to know how to do the math parts, or say how to build such math modules?

For example, in the classical game SimCity:

• an economic model to simulate the supply and demand of the city, then calculate how many people live in each building, how many people work there.
• a traffic model to simulate the commute time of the citizens,
• in another game, there'd be a whole stock market, where the player and sim-citizens can buy and sell.

Obviously, we cannot simulate every single citizen, every single car, every single trader in the market, we need some math modules and formulas.

I'm making a fake SimCity and almost finished the graphics parts. Now I'd like to know how to do the math parts, or how to build such math modules.