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Is an open-sourced World Stock Index a pipe-dream?
An index is just a mathematical calculation based on stock prices. Anyone can create such a calculation and (given a little effort) publish it based on publicly available data. The question of "open source" is simply whether or not the calculator chooses to publish the calculation used. Given how easy an index is to create, the issue is not the "open source" nature or otherwise, but its credibility and usefulness.