Refugees who fled the conflict in Sudan's Darfur region to eastern Chad gather water at a well as a dust storm approaches, June 2008.
Finbarr O'Reilly / Courtesy Reuters

Poverty is powerful. For those within its grasp, it alters every aspect of existence. People who happen to be born poor consume less than those born rich. They have worse access to education and healthcare and frequent exposure to corruption, extortion, and violence. An average person born in a place like Sub-Saharan Africa lives in a very different world than an average American.

But does poverty affect the way people feel, think, and act? This seems like an obvious question, and indeed, it is neither new nor mine: over the centuries, scientists, policymakers, and writers have asked whether poverty has psychological and behavioral consequences. Yet for many years, the question has been difficult to study because asking it has often been confused with blaming the poor for their poverty or attributing to them deficiencies that caused it. One prominent example is a 1965 report by Daniel Patrick Moynihan, who was assistant

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