An Oxford academic recommends living on as little as you can and giving away the rest.

Some people suggest I should first make huge amounts of money. My answer is that by doing it my way I have attracted others to join me—and our collective giving will be far more substantial than anything I could have made on my own. Together, the members of Giving What We Can have pledged to donate £14m over the course of our careers, which should save between 30,000 and 100,000 lives. I'm not sure I could have made that much for charity by playing the markets.

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