Figure 1

The master screen that is displayed on the screen of the person hosting the simulation. The master screen controls game flow and helps visualize the dynamics of the game. A. Switch that removes the player names on the right hand display screen. B. Slider that sets the value of money punished individuals lose if punished by other players. C. Button that restarts the game and resets all values to initial values. D. Button that runs the entire step once (including Take Money and Give Money and Plotting) E. Button that retrieves money from students. F. Button to distribute money to students. Note, buttons associated with c and d are best used for demonstrating mathematics of game. G. Value of bank in previous step. H. Number of turns that have taken place. I. Plot of total punishment over time. Note that punishment is the cumulative punishment over time. J. Plot of communal bank over time. K. Plot of average investment of participants over time. L. Screen that lists all player names, their cash on hand, and how much they invested in the previous turn. A red square appears next to the richest player.