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This simple simulation was originally produced over 20 years ago to demonstrate the potential impact of cultural gift aid on a community that does not develop economically to replace the gift. It has since been used in teaching. So I won't make my point just yet, but rather let it be demonstrated.
The Initialise button, initialises the variable initially to a constant in the simulation code, and subquently to the last value entered by the user.
The simulation is written in javascript, and is entirely contained in the source of this page. If you want to modify it, simply do a "Save" from the File menu, making sure you choose "source" or "html" from the save menu, thus not selecting so called 'archive' formats or pdf format. Then you can edit the page in the program of your choice and run it directly in a browser.
It runs in Firefox and Safari, and should work in recent versions of Internet Explorer and others.