The following links are to various applets I have developed for economics and econometrics classes. More should appear in the near future. If you are an instructor and you would like to use any of them for a class, you are invited to do so. If you do, I only ask that you:

(1) include the appropriate attribution. Some applets have an information button. In such cases, provision of a fully operational applet is sufficient. If the applet does not include an information button, please include the following statement (or its informational equivalent) somewhere in the surrounding html: "This applet written by Geoffrey Gerdes."

(2) tell me you are using it. Suggestions to improve the applets are encouraged as well. Please send an e-mail to gerdes@ucla.edu. I hope you enjoy them!

• 2D Function Studio This applet is nearing completion. It is being designed to help illustrate the behavior of functions as parameters are adjusted.

• An Edgeworth Box This applet depicts exchange between two Cobb-Douglas utility maximizers. The utility functions and endowments of each player can be adjusted, and the set of individually rational, pareto improving points shared by the players, the core, the contract curve, and the Walrasian equilibrium with the associated price line may be depicted for any number of "economies."
• Elasticity with Linear Demand Helps the student to explore the variation of elasticity over the range of price/quantity combinations for a linear demand curve, and the implications for the total revenue of a monopolist. Students can vary prices and quantities by dragging sliders, and can change the parameter values of the demand equation.
• Student's t Distribution Displays the shape of the 't' distribution superimposed on the normal distribution. A slider is used to allow the variation of degrees of freedom and view resulting change in shape. The 5% critical values of a two-tailed test for both distributions is displayed.
• The F Distribution Same as the 't' applet, but two degrees of freedom sliders, one for the numerator and one for the denominator.

Working demo, but not finished for various reasons

• Supply of a Competitive Firm
• Demand curves from optimal consumption choices