Loading...
TED: Esther Duflo – Social Experiments to Fight Poverty
Now Watching
TED: Esther Duflo – Social Experiments to Fight Poverty

Alleviating poverty is more guesswork than science, and lack of data on aid's impact raises questions about how to provide it. But Clark Medal-winner Esther Duflo says it's possible to know which development efforts help and which hurt—by testing solutions with randomized trials. 

Flash Player 9.0.115+ or HTML5 video support is required to play this video.
 
Loading...

Esther Duflo is a development economist who takes economics out of the lab and into the field to discover the causes of poverty and means to eradicate it. Read more about Esther Duflo at TED.com.

Produced by TED. Reproduced by Creative Commons licence.

Available translated into 10 other languages at TED.com.

 

Loading...

Share this video

Include start time Get current time
Include related videos, articles & actions
Loading...

Segment 1

TITLE
Esther Duflo
TITLE
February, 2010. Long Beach, California
ESTHER DUFLO
So here it is: You can check, I am short, I'm French, I have a pretty strong French accent, so that's going to be clear in a moment. Maybe a sobering thought, and something you all know about. And I suspect many of you gave something to the people of Haiti this year. And there is something else that I believe, in the back of your mind, you also know is, everyday, 25,000 children die of entirely preventable causes. That's a Haiti earthquake every eight days. And I suspect that many of you probably gave something towards that problem as well, but somehow it doesn't happen with the same intensity.
TITLE
Recorded at TED2010
ESTHER DUFLO
So why is that? Well, here is a thought experiment for you. Imagine you have a few million dollars that you've raised. Maybe you're a politician in a developing country, and you have a budget to spend; you want to spend it on the poor. How do you go about it? Do you believe the people who tell you that all we need to do is to spend money, that we know how to eradicate poverty, we just need to do more? Or do you believe the people who tell you that aid is not going to help, on the contrary it might hurt, it might exacerbate corruption, dependence, etc.? Or maybe you turn to the past. After all, we have spent billions of dollars on aid. Maybe you look at the past and see has it done any good.
ESTHER DUFLO
And, sadly, we don't know. And, worst of all, we will never know. And the reason is that -- take Africa, for example -- Africa suddenly got a lot of aid. These are the blue bars. And the GDP in Africa is not making much progress. Okay, fine. How do you know what would have happened without the aid? Maybe it would have been much worse. Or maybe it would have been much better. We have no idea. We don't know what the counterfactual is. There's only one Africa.
ESTHER DUFLO
So what do you do: to give the aid and hope and pray that something comes out of it, or do you focus on your everyday life and let the earthquake every eight days continue to happen? The thing is, if we don't know whether we are doing any good, we are not any better than the medieval doctors and their leeches. Sometimes the patient gets better, sometimes the patient dies. Is it the leeches? Is it something else? We don't know.
ESTHER DUFLO
So here are some other questions; they're smaller questions, but they are not that small. Immunization, that's the cheapest way to save a child's life. And the world has spent a lot of money on it. The GAVI and the Gates Foundation are each pledging a lot of money towards it. And developing countries themselves have been doing a lot of effort. And yet, every year, at least 25 million children do not get the immunization they should get. So this is what you call a "last mile problem." The technology is there. The infrastructure is there. And yet, it doesn't happen. So you have your million. How do you use your million to solve this last mile problem?
ESTHER DUFLO
And here's another question: malaria. Malaria kills almost 900,000 people every year, most of them in sub-Saharan Africa, most of them under five. In fact that is the leading cause of under-five mortality. We already know how to cure malaria, but some people come to you and say, "You have your millions. How about bed nets?" Bed nets are very cheap. For USD$10, you can manufacture and ship an insecticide-treated bed net, and you can teach someone to use them. And, not only do they protect the people who sleep under them, but they have these great contagion benefits. If half of a community sleeps under a net, the other half also benefits because the contagion of the disease spread. And yet, only a quarter of kids at risk sleep under a net. Societies should be willing to go out and subsidize the net, give them for free, or, for that matter, pay people to use them because, of those contagion benefits. "Not so fast," say other people. "If you give the nets for free, people are not going to value them. They're not going to use them, or at least they're not going to use them as bed nets, maybe as fishing nets." So, what do you do? To give the nets for free, to maximize coverage? Or do you make people pay in order to make sure that they really value them? How do you know?
ESTHER DUFLO
And a third question: Education. Maybe that's the solution. Maybe we should send kids to school. But how do you do that? Do you hire teachers? Do you build more schools? Do you provide school lunch? How do you know?
ESTHER DUFLO
So here is the thing. I cannot answer the big question, whether aid did any good or not, but these three questions, I can answer them. It's not the Middle Ages anymore. It's the 21st century. And in the 20th century, randomized, controlled trials have revolutionized medicine by allowing us to distinguish between drugs that work and drugs that don't work. And you can do the same randomized, controlled trial for social policy. You can put social innovation to the same rigorous, scientific tests that we use for drugs. And in this way, you can take the guesswork out of policy-making by knowing what works, what doesn't work, and why. And I'll give you some examples with those three questions.

Segment 2

ESTHER DUFLO
So I start with immunization. Here's Udaipur district, Rajasthan, beautiful. Well, when I started working there, about 1 percent of children were fully immunized. That's bad, but there are places like that. Now, it's not because the vaccines are not there. They are there and they are free. And it's not because parents do not care about their kids. The same child that is not immunized against measles, if they do get measles, parents will spend thousands of rupees to help them. So you get these empty village sub-centers and crowded hospitals. So what's the problem? Well, part of the problem, surely, is people do not fully understand. After all, in this country as well, all sorts of myths and misconceptions go around immunization. So, if that's the case, that's difficult, because persuasion is really difficult. But maybe there is another problem as well. It's going from intention to action. Imagine you are a mother in Udaipur district, Rajasthan. You have to walk a few kilometers to get your kids immunized. And maybe when you get there, what you find is this: the sub-center is closed, so you have to come back. And you are so busy, and you have so many other things to do, you will always tend to postpone and postpone, and eventually it gets too late. Well, if that's the problem, then that's much easier because, a) we can make it easy, and b) we can maybe give people a reason to act today, rather than wait till tomorrow.
ESTHER DUFLO
So these are simple ideas, but we didn't know. So let's try them. So what we did is, we did a randomized, controlled trial in 134 villages in Udaipur districts. So the blue dots are selected randomly, we made it easy. I'll tell you how in a moment. In the red dots, we made it easy and gave people a reason to act now. The white dots are comparisons, nothing changed. So we make it easy by organizing this monthly camp where people can get their kids immunized. And then you make it easy and give a reason to act now by adding a kilo of lentils for each immunization. Now, a kilo of lentils is tiny. It's never going to convince anybody to do something that they don't want to do. On the other hand, if your problem is you tend to postpone, then it might give you a reason to act today rather than later.
ESTHER DUFLO
So what do we find? Well, beforehand, everything is the same. That's the beauty of randomization. Afterwards, the camp, just having the camp, increases immunization from six percent to 17 percent. That's full immunization. That's not bad. That's a good improvement. Add the lentils and you reach, and you reach to 38 percent. So here is you've got your answer. Make it easy and give a kilo of lentils, you multiply immunization rate by six. Now, you might think, "Well, but it's not sustainable. We cannot keep giving lentils to people." Well, it turns out it's wrong economics because it is cheaper to give lentils than not to give them. Since you have to pay for the nurse anyway, the cost per immunization ends up being cheaper if you give incentives than if you don't.
ESTHER DUFLO
How about bed nets? Should you give them for free, or should you ask people to pay for them? So the answer hinges on the answer to three simple questions. One is: if people must pay for a bed net, are they going to purchase them? The second one is: if I give bed nets for free, are people going to use them? And the third one is: do free bed nets discourage future purchase? The third one is important because, if we think people get used to handouts, it might destroy markets to distribute free bed nets. Now this is a debate that has generated a lot of emotion and angry rhetoric. It's more ideological than practical, but it answers ... theses are easy questions. We can know the answer to these questions. We can just run an experiment. And many experiments have been run, and they all have the same results, so I'm just going to talk to you about one.
ESTHER DUFLO
And this one that was in Kenya, they went around and distributed to people vouchers, discount vouchers. So people could with their voucher could get the bed net in the local pharmacy. And some people get 100 percent discount, and some people get 20 percent discounts, and some people get 50 percent discounts, etc. And now we can see what happens. So, how about the purchasing? Well, what you can see is that when people have to pay for their bed nets, the coverage rate really falls down a lot. So even with partial subsidy -- three dollars is still not the full cost of a bed net -- and now you only have 20 percent of the people with the bed nets, you lose the health motive, that's not great. Second thing is, how about the use? Well, the good news is, people, if they have the bed nets, will use the bed nets regardless how they got it. If they got it for free, they use it. If they have to pay for it, they use it. How about the long term? In the long term, people who got the free bed nets, one year later, were offered the option to purchase a bed net at two dollars. And people who got the free one were actually more likely to purchase the second one than people who didn't get a free one. So people do not get used to handouts; they get used to nets. Maybe we need to give them a little bit more credit.

Segment 3

ESTHER DUFLO
So, that's for bed nets. So you would think, "Well that's great: you know how to immunize kids, you know how to give bed nets." But what politicians need is a range of options. They need to know: out of all the things I could do, what is the best way to achieve my goals? So suppose your goal is to get kids into school. There's so many things you could do. You could pay for uniforms, you could eliminate fees, you could build latrines, you could give girls sanitary pads, etc, etc. So what's the best? Well, at some level, we think all of these things should work. So, is that sufficient, like, if we think they should work intuitively, should we go for them? Well, in business, that's certainly not the way we would go about it.
ESTHER DUFLO
Consider, for example, transporting goods. Before the canals were invented in Britain, before the Industrial Revolution, goods used to go on horse carts. And then canals were built, and with the same horseman and the same horse, you could carry 10 times as much cargo. So should they have continued to carry the goods on the horse carts, on the ground, that they would eventually get there? Well, if that had been the case, there would have been no Industrial Revolution. So why shouldn't we do the same with social policy? In technology, we spend so much time experimenting, fine-tuning, getting the absolute cheapest way to do something, so why aren't we doing that with social policy?
ESTHER DUFLO
Well, with experiments, what you can do is answer a simple question. Suppose you have USD$100 to spend on various interventions: how many extra years of education do you get for your USD$100? Now I'm going to show you what we get with various education interventions. So the first ones are if you want the usual suspects: hire teachers, school meals, school uniforms, scholarships. And that's not bad. For your USD$100, you get between one and three extra years of education. Things that don't work so well is bribing parents, just because so many kids are already going to school that you end up spending a lot of money. And here are the most surprising results. Tell people the benefits of education. That's very cheap to do. So for every USD$100 you spend doing that, you get 40 extra years of education. And, in places where there are worms, intestinal worms, cure the kids of their worms. And for every USD$100, you get almost 30 extra years of education. So this is not your intuition. This is not what people would have gone for, and yet, these are the programs that work. We need that kind of information. We need more of it. And then we need it to guide policy.
ESTHER DUFLO
So now, I started from the big problem, and I couldn't answer it. And I cut it into smaller questions, and I have the answer to these smaller questions. And they are good, scientific, robust answers.
ESTHER DUFLO
So let's go back to Haiti for a moment. In Haiti, about 200,000 people died. Actually, a bit more by the latest estimate. And the response of the world was great: USD$2 billion got pledged just last month. So that's about USD$10,000 per death. That doesn't sound that much when you think about it. But if we were willing to spend USD$10,000 for every child under five who dies, that would be USD$90 billion per year just for that problem. And yet it doesn't happen. So, why is that? Well, I think one part of the problem is that, in Haiti, although the problem is huge, somehow we understand it, it's localized. You give your money to Doctors Without Borders, you give your money to Partners in Health, and they'll send in the doctors, and they'll send in the lumber, and they'll helicopter things out and in. And the problem of poverty is not like that. So, first, it's mostly invisible. Second, it's huge. And, third, we don't know whether we're doing the right thing. There's no silver bullet. You cannot helicopter people out of poverty. And that's very frustrating.
ESTHER DUFLO
But look what we just did today. I gave you three simple answers to three questions. Give lentils to immunize people, provide free bed nets, deworm children. With immunization or bed nets, you can save a life for USD$300 per life saved. With deworming, you can get an extra year of education for USD$3. So we cannot eradicate poverty just yet, but we can get started. And maybe we'll get started small with things that we know are effective.
ESTHER DUFLO
Here's an example of how this can be powerful: deworming. Worms have a little bit of a problem grabbing the headlines. They are not beautiful and don't kill anybody. And yet, when the young global leader in Davos showed the numbers I gave you, they started Deworm the World. And thanks to Deworm the World, and the effort of many country governments and foundations, 20 million school-aged children got dewormed in 2009. So this evidence is powerful, it can prompt action.
ESTHER DUFLO
So we should get started now. Now, it's not going to be easy. It's a very slow process. You have to keep experimenting, and sometimes ideology has to be trumped by practicality. And sometimes what works somewhere doesn't work elsewhere. So it's a slow process, but there is no other way. This economics I'm proposing, it's like 20th-century medicine. It's a slow, deliberative process of discovery. There is no miracle cure, but modern medicine is saving millions of lives every year, and we can do the same thing.
ESTHER DUFLO
And now, maybe, we can go back to the bigger question that I started with at the beginning. I cannot tell you whether the aid we have spent in the past has made a difference, but can we come back here in 30 years and say, "What we have done, it really prompted a change for the better." I believe we can, and I hope we will. Thank you.
TITLE
TED. New TEDTalks each week at www.TED.com