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Free bednets to fight malaria

Evidence from randomized evaluations played a role in shifting global opinion to support free distribution of key preventive health products.

Woman receives a free insecticide-treated bednet at a health clinic in Kakagena County, Kenya.

A series of randomized evaluations by J-PAL-affiliated researchers on the best pricing strategies for preventive health products has helped shift the global debate in favor of providing life-saving products, such as insecticide-treated bednets, for free. By demonstrating that providing preventive health products for free increases takeup, this research has helped organizations rethink their approach to user fees in order to increase their reach.

The Problem: Despite a large reduction in the global malaria burden over the past two decades, malaria still claims hundreds of thousands of lives each year.

In 2016, there were an estimated 216 million cases and an estimated 445,000 malaria deaths globally. Approximately 91 percent of these deaths occurred in sub-Saharan Africa, affecting primarily children under five years of age.1 Public health experts and officials have long agreed that prevention through widespread use of insecticide-treated nets (ITNs or bednets) is a highly effective method of preventing malaria transmission. Yet, for many years, ITN coverage has been low among the most vulnerable groups, such as pregnant women and children under five.

Bednets and many other preventive health products, such as deworming medication and water purification treatment, have positive effects that can extend beyond the individuals using them; for example, sleeping under an ITN can reduce not only one’s likelihood of contracting malaria, but also the rate at which malaria spreads within the community.

Standard economic analysis implies that to maximize take-up, these goods should be provided at zero cost to the user. However, there is a long-running debate on whether beneficiaries of these public health programs should bear some of the cost. Many have argued that charging a nominal price for health products will save resources by screening out people who would not use the product and increase the likelihood that those who have bought it will actually use it. Charging fees may also raise revenue to make programs more sustainable. Conversely, others have argued that cost-sharing may decrease program coverage by reducing demand. In addition, if those most vulnerable to malaria are also less likely to be able to afford even a small price, then charging fees could significantly reduce the health benefits of the partial subsidy.

The Research: J-PAL affiliated researchers conducted more than a dozen randomized evaluations in eight countries to empirically test the arguments underlying this debate, and evaluate how pricing affected take-up and use of various preventive health products.

To test whether it is preferable to freely distribute bednets or to require a co-payment by recipients, J-PAL affiliates Jessica Cohen (Harvard University) and Pascaline Dupas (Stanford University) set up a randomized evaluation to evaluate the impacts of different subsidies on take-up and use of ITNs when delivered to pregnant women in Kenya. In sixteen randomly selected health clinics, ITNs were offered at a subsidized rate, with the discount varying between 90 and 100 percent of market price.2

Researchers found that ITN take-up was 60 percentage points lower when the price was US$0.60 than when it was US$0 (i.e., at a 90 percent instead of a 100 percent subsidy). Furthermore, the majority of women who received ITNs for free put them to proper use, and there was no statistical difference in usage rates between women receiving the ITN for free and those who paid for the product. Altogether, the share of pregnant women covered by an ITN at clinics with free distribution was 65 percent, compared with 15 percent at clinics charging US$0.60 for the ITN. Given the large benefit to the community associated with widespread usage of insecticide-treated nets, the considerably higher coverage rate under free distribution, and the fixed costs of the program, these results suggest that free distribution of ITNs is both more efficient and more cost-effective at reducing malaria than charging fees.

A similar study focused on the general population, rather than only pregnant women, found similar results held over time: after a year, coverage rates remained considerably higher when ITNs were given for free rather than sold. J-PAL affiliates have also conducted evaluations on other preventive health products such as deworming medication, water disinfectant, and handwashing soap. These evaluations, taking place in contexts where participants had very low ability to pay, all pointed to the efficacy of subsidizing user fees for key preventive health products by eliminating cost-sharing when possible.

For more details, see the evaluation summary and the related policy insight.

From Research to Action: The clear direction of findings across contexts and products helped shift policy in favor of reducing user fees for key preventive health products.

This research played a part in shifting global opinion to support free distribution of key preventive health products. Many organizations reconsidered their policies to charge for health services and opted instead to distribute ITNs and other health products free of charge.

A number of influential organizations now recognize that the elimination of user fees is the most effective way of quickly increasing take-up of key preventive health products. These groups include the United Kingdom Department for International Development (DFID), the United Nations Millennium Project, and the World Health Organization.3 In 2009, the British government cited the study by Cohen and Dupas in calling for the abolition of user fees for health products and service in poor countries.4

For some groups, supporting the abolition of user fees marks a shift from their traditional models. Population Services International (PSI), a leader in malaria prevention that provides malaria control support to national Ministries of Health in over thirty countries worldwide, has historically supported the practice of cost-sharing for ITNs. Today, PSI’s bednet delivery strategies include routine facility-based delivery, mass free distribution for rapid scale up, and continued engagement of the private sector in some locations.

GiveWell cites J-PAL research in their endorsement of the Against Malaria Foundation (AMF)—an NGO that provides funding and supports free distribution of long-lasting insecticide-treated nets in developing countries—as one of its top charities.5 This has resulted in more than US$7 million in additional funding to AMF, enough to procure 1.6 million bednets (at a rate of US$4.29 per bednet).6

Anti-malaria bednet coverage in Africa

Figure 1: Hillebrandt, Hauke. 2015. “Bednets Have Prevented 450 Million Cases of Malaria.” Giving What We Can Blog, Giving What We Can, December 18, 2015.

This shift in strategy has helped contribute to reductions in the global malaria burden. Malaria bednet ownership rates amongst at-risk households increased by 30 percentage points between 2010 and 2016.7 Health officials hope this increased ownership can contribute to achieving the WHO target of reducing malaria incidence by at least 40 percent by 2020 relative to 2015 levels.


Berry, James, Greg Fischer, and Raymond Guiteras. “Eliciting and Utilizing Willingness-to-Pay: Evidence from Field Trials in Northern Ghana.” CEPR Discussion Paper No, 10703, December 2015.

Cohen, Jessica, and Pascaline Dupas. 2010. "Free Distribution or Cost-Sharing? Evidence from a Randomized Malaria Prevention Experiment." Quarterly Journal of Economics 125 (1): 1-45.

Dupas, Pascaline. 2009. "What Matters (and What Does Not) in Households’ Decision to Invest in Malaria Prevention?” American Economic Review 99 (2): 224-30.

Dupas, Pascaline. 2014. “Short-Run Subsidies and Long-Run Adoption of New Health Products: Evidence from a Field Experiment.” Econometrica 82 (1): 197-28.

Kremer, Michael, and Edward Miguel. 2007. "The Illusion of Sustainability." Quarterly Journal of Economics 122: 1007-1065.

Meredith, Jennifer, Jonathan Robinson, Sarah Walker, and Bruce Wydick. 2013. “Keeping the Doctor Away: Experimental Evidence on Investment in Preventative Health Products.” Journal of Development Economics 105: 196-210.

Peletz, Rachel, Alicea Cock-Esteb, Dorothea Ysenburg, Salim Haji, Ranjiv Khush, and Pascaline Dupas. 2017. "Supply and Demand for Improved Sanitation: Results from Randomized Pricing Experiments in Rural Tanzania." Environmental Science & Technology 51 (12): 7138-7147.

1World Health Organization. 2017. World Malaria Report 2017.

2This program was not done in a vacuum: at that time, Population Services International was running a program through which Kenyan health clinics sold ITNs to pregnant women at an 85 percent discount.

3Robert, Emilie, and Valéry Ridde. 2013. “Global Health Actors No Longer in Favor of User Fees: A Documentary Study.” Globalization and Health 9 (29).

4Brown, Gordon. 2009. “PM’s Article on Universal Healthcare." The Official Site of the Prime Minister’s Office, Sept. 23, 2009.

5GiveWell. 2017. “Against Malaria Foundation.” Last modified August 2018.

6Crispin, Natalie. 2018. “Allocation of Discretionary Funds from Q1 2018.” The GiveWell Blog, GiveWell, June 4, 2018. | Crispin, Natalie. 2018. “Allocation of Discretionary Funds from Q2 2018.” The GiveWell Blog, GiveWell, August 28, 2018.

7World Health Organization. 2017. World Malaria Report 2017.