The GiveWell Blog

Revisiting the evidence on malaria eradication in the Americas


  • Two of GiveWell’s top charities fight malaria in sub-Saharan Africa.
  • GiveWell’s valuations of these charities place some weight on research by Hoyt Bleakley on the impacts of malaria eradication efforts in the American South in the 1920s and in Brazil, Colombia, and Mexico in the 1950s.
  • I reviewed the Bleakley study and mostly support its key findings: the campaigns to eradicate malaria from Brazil, Colombia, and Mexico, and perhaps the American South as well, were followed by accelerated income gains for people whose childhood exposure to the disease was reduced. The timing of these events is compatible with the theory that rolling back malaria increased prosperity.

Read More

Key questions about Helen Keller International’s vitamin A supplementation program

One of our two new top charities this year is Helen Keller International (HKI)’s vitamin A supplementation program. We named HKI’s vitamin A supplementation program a top charity this year because:

  • There is strong evidence from many randomized controlled trials of vitamin A supplementation that the program leads to substantial reductions in child deaths.
  • HKI-supported vitamin A supplementation programs are inexpensive (we estimate around $0.75 in total costs per supplement delivered) and highly cost-effective at preventing child deaths in countries where HKI plans to work using GiveWell-directed funds.
  • HKI is transparent—it has shared significant, detailed information about its programs with us, including the results and methodology of monitoring surveys HKI conducted to determine whether its vitamin A supplementation programs reach a large proportion of targeted children.
  • HKI has a funding gap—we believe it is highly likely that its vitamin A supplementation programs will be constrained by funding next year.

HKI’s vitamin A supplementation program is an exceptional giving opportunity, but as with the case for donating to any of our other top charities, not a “sure thing.”

I’m the Research Analyst who has led our work on HKI this year. In this post, I discuss some key questions about the impact of Helen Keller International’s vitamin A supplementation program and what we’ve learned so far. I also discuss GiveWell’s plans for learning more about these issues in the future.

Read More

How uncertain is our cost-effectiveness analysis?

When our cost-effectiveness analysis finds robust and meaningful differences between charities, it plays a large role in our recommendations (more on the role it plays in this post).

But while our cost-effectiveness analysis represents our best guess, it’s also subject to substantial uncertainty; some of its results are a function of highly debatable, difficult-to-estimate inputs.

Sometimes these inputs are largely subjective, such as the moral weight we assign to charities achieving different good outcomes (e.g. improving health vs. increasing income). But even objective inputs are uncertain; a key input for anti-malaria interventions is malaria mortality, but the Institute for Health Metrics and Evaluation estimates 1.6 times more people died in Africa from malaria in 2016 (641,000) than the World Health Organization does (407,000; pg. 41).((Differences in their methodologies have been discussed, with older figures, in a 2012 blog post by the Center for Global Development.))

Before we finalized the charity recommendations we released in November, we determined how sensitive our results were to some of our most uncertain parameters.

Read More

Update on our work on outreach

GiveWell’s impact is a function of the quality of our research and the amount of money we direct to our recommended charities (our “money moved”). Historically, we’ve focused mostly on research because we felt that the quality of our recommendations was a greater constraint to our impact than our money moved.

This has changed. Outreach is now a major organizational priority. The goal of this work is to increase the amount of money we direct to our top-recommended charities.

Read More

Maximizing the impact of your donation: saving on fees means more money for great charities

We recently discussed how you can give to reduce the administrative burden on charities when giving. This post will focus on how you can save money on fees and give tax-efficiently so that more of your charitable budget can go directly to the organizations you want to support. This is an updated version of a post we originally ran in 2012; some content is the same, other content has been added or updated.

Read More

December 2017 open thread

Our goal with hosting quarterly open threads is to give blog readers an opportunity to publicly raise comments or questions about GiveWell or related topics (in the comments section below). As always, you’re also welcome to email us at or to request a call with GiveWell staff if you have feedback or questions you’d prefer to discuss privately. We’ll try to respond promptly to questions or comments.

Read More