Deaton argues that, by trying to help poor people in developing countries, the rich world may actually be corrupting those nations’ governments and slowing their growth. According to Deaton, and the economists who agree with him, much of the $135 billion that the world’s most developed countries spent on official aid in 2014 may not have ended up helping the poor.

It sounds kind of crazy to say that foreign aid often hurts, rather than helps, poor people in poor countries. Yet that is what Angus Deaton, the newest winner of the Nobel Prize in economics, has argued.

Deaton, an economist at Princeton University who studied poverty in India and South Africa and spent decades working at the World Bank, won his prize for studying how the poor decide to save or spend money. But his ideas about foreign aid are particularly provocative. Deaton argues that, by trying to help poor people in developing countries, the rich world may actually be corrupting those nations’ governments and slowing their growth. According to Deaton, and the economists who agree with him, much of the $135 billion that the world’s most developed countries spent on official aid in 2014 may not have ended up helping the poor.

The idea of wealthier countries giving away aid blossomed in the late 1960s, as the first humanitarian crises reached mass audiences on television. Americans watched through their TV sets as children starved to death in Biafra, an oil-rich area that had seceded from Nigeria and was now being blockaded by the Nigerian government, as Philip Gourevitch recalled in a 2010 story in the New Yorker. Protesters called on the Nixon administration for action so loudly that they ended up galvanizing the largest nonmilitary airlift the world had ever seen. Only a quarter-century after Auschwitz, humanitarian aid seemed to offer the world a new hope for fighting evil without fighting a war.

There was a strong economic and political argument for helping poor countries, too. In the mid-20th century, economists widely believed that the key to triggering growth — whether in an already well-off country or one hoping to get richer — was pumping money into a country’s factories, roads and other infrastructure. So in the hopes of spreading the Western model of democracy and market-based economies, the United States and Western European powers encouraged foreign aid to smaller and poorer countries that could fall under the influence of the Soviet Union and China.

The level of foreign aid distributed around the world soared from the 1960s, peaking at the end of the Cold War, then dipping before rising again. Live Aid music concerts raised public awareness about challenges like starvation in Africa, while the United States launched major, multibillion-dollar aid initiatives. And the World Bank and advocates of aid aggressively seized on research that claimed that foreign aid led to economic development.

Deaton wasn’t the first economist to challenge these assumptions, but over the past two decades his arguments began to receive a great deal of attention. And he made them with perhaps a better understanding of the data than anyone had before. Deaton’s skepticism about the benefits of foreign aid grew out of his research, which involved looking in detail at households in the developing world, where he could see the effects of foreign aid intervention.

“I think his understanding of how the world worked at the micro level made him extremely suspicious of these get-rich-quick schemes that some people peddled at the development level,” says Daron Acemoglu, an economist at MIT.

The data suggested that the claims of the aid community were sometimes not borne out. Even as the level of foreign aid into Africa soared through the 1980s and 1990s, African economies were doing worse than ever, as the chart below, from a paper by economist Bill Easterly of New York University, shows.

The effect wasn’t limited to Africa. Many economists were noticing that an influx of foreign aid did not seem to produce economic growth in countries around the world. Rather, lots of foreign aid flowing into a country tended to be correlated with lower economic growth, as this chart from a paper by Arvind Subramanian and Raghuram Rajan shows.

The countries that receive less aid, those on the left-hand side of the chart, tend to have higher growth — while those that receive more aid, on the right-hand side, have lower growth.

Why was this happening? The answer wasn’t immediately clear, but Deaton and other economists argued that it had to do with how foreign money changed the relationship between a government and its people.

Think of it this way: In order to have the funding to run a country, a government needs to collect taxes from its people. Since the people ultimately hold the purse strings, they have a certain amount of control over their government. If leaders don’t deliver the basic services they promise, the people have the power to cut them off.

Deaton argued that foreign aid can weaken this relationship, leaving a government less accountable to its people, the congress or parliament, and the courts.

“My critique of aid has been more to do with countries where they get an enormous amount of aid relative to everything else that goes on in that country,” Deaton said in an interview with Wonkblog. “For instance, most governments depend on their people for taxes in order to run themselves and provide services to their people. Governments that get all their money from aid don’t have that at all, and I think of that as very corrosive.”

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