This year, we re-evaluated the cost effectiveness of direct cash transfers as implemented by our friends at GiveDirectly. Our complete writeup is here, and full of fascinating details, but the main headline is: we now estimate that GiveDirectly’s flagship cash program is 3 to 4 times more cost-effective than we’d previously estimated.

It is important to note two things: (1) this won’t alter our Top Charities list or our grantmaking—we believe that the programs we currently direct funding to are at least twice as cost-effective as this new estimate, so we don’t expect to support GiveDirectly’s flagship program in the near term; and (2) this update is the result of re-evaluating the evidence underpinning GiveDirectly’s program, which we hadn’t formally done since 2019—the structure of GiveDirectly’s program has not changed (though they are now carrying it out in more locations since our last evaluation).

We share more information about our research below. You can read our full, detailed report here. You can read GiveDirectly’s blog post on our re-evaluation here.

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Last week, we published an updated analysis on “spillover” effects of GiveDirectly‘s cash transfer program: i.e., effects that cash transfers may have on people who don’t receive cash transfers but who live nearby those who do receive cash transfers.((For more context on this topic, see our May 2018 blog post.)) We concluded: “[O]ur best guess is that negative or positive spillover effects of cash are minimal on net.” (More)

Economist Berk Özler posted a series of tweets expressing concern over GiveWell’s research process for this report. We understood his major questions to be:

1. Why did GiveWell publish its analysis on spillover effects before a key study it relied on was public? Is this consistent with GiveWell’s commitment to transparency? Has GiveWell done this in other cases?
2. Why did GiveWell place little weight on some papers in its analysis of spillover effects?
3. Why did GiveWell’s analysis of spillovers focus on effects on consumption? Does this imply that GiveWell does not value effects on other outcomes?

These questions apply to GiveWell’s research process generally, not just our spillovers analysis, so the discussion below addresses topics such as:

• When do our recommendations rely on private information, and why?
• How do we decide on which evidence to review in our analyses of charities’ impact?
• How do we decide which outcomes to include in our cost-effectiveness analyses?

Finally, this feedback led us to realize a communication mistake we made: our initial report did not communicate as clearly as it should have that we were specifically estimating spillovers of GiveDirectly’s current program, not commenting on spillovers of cash transfers in general. We will now revise the report to clarify this.

Note: It may be difficult to follow some of the details of this post without having read our report on the spillover effects of GiveDirectly’s cash transfers.

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