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Suppose Alice is an effective altruist who supports whatever charity you think is most important and does a really good job of it. She lives in a town of 1000 people where nobody else is an effective altruist and everyone else just lives a pretty decent life and spends their extra money on, I don’t know, breeding virtual cats or something. Every time Bob pays a dollar in taxes, it destroys a random two dollars’ worth of wealth somewhere in the town.