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In pursuit of tough questions

MIT professor Roberto Rigobon, co-founder of the Billion Prices Project, is trying to improve the world one measurement at a time.

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PROFESSOR Roberto Rigobon's formula for advancing human knowledge is fairly easy to remember: Don't do easy.

The dauntless pursuit of big and meaningful problems and an obsession with understanding the limitations of data led Professor Rigobon and his collaborator Alberto Cavallo to take