This model simulates the distribution of wealth, based on the work done by Robert Axtell. Wealth is represented as an amount of grain. We see Pareto's Law, which describes how a small number of people acquire most of the available wealth (leaving a disproportionately large number of poor).
For detailed instructions on using the program, take a look at the info window from the Wealth Distribution model.
Click on one of the pictures to see a quicktime movie of the model: