The following simulation looks at how a city's wealth corresponds to an increase or decrease in population size. Each city produces different objects that cost more or less money. Cities buy and sell these products to other cities. As a city's wealth increases, more people will move to that city. If a city is loosing money, then people will search for an alternative city to move to. 

To run the model you first need to download the free application NetLogo: Download Here

You can then download and run the city network model: Here