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Has anyone found an effective way to scrub indoor CO2?

HVAC systems with outdoor air inputs (like DOAS) may be an effective way to reduce the buildup of CO2, VOCs, etc indoors in an automated and temperature-controlled manner.

US bill limiting patient philanthropy?

I agree that this is a possible outcome (perhaps there would be loopholes in the law, foundations and DAFs would pursue other investment strategies like using leverage to achieve higher returns, or philanthropists would shift funds into alternative non-regulated entities), and if spending down endowments is the outcome, this certainly seems like it would have major ramifications on the entities subject to this regulation.

If these regulations persist in the long-run, I would imagine that patient philanthropy would transition to storing funds in other entities, like corporations, that are not subject to these regulations. Entities like corporations are not tax advantaged, so funding going into those organizations would be fully taxable. Investment gains might be fully or partially taxable (current regulations state that C Corps can only write off 25% of their total income for donations). A C Corp could switch to directly paying for products/services to avoid the limit of write-offs, or make those "purchases" through other entities like charities, so there would probably be ways to make the investment income non-taxable. Either way, the primary mechanism of impact for patient philanthropy—the effect of compounding interest over many years—would be preserved even if regulation to increase disbursements perpetually into the future were to pass.

How You Can Counterfactually Send Millions of Dollars to EA Charities

Thanks for your response Catherine! It's great to hear that GiveWell is moving in this direction!

Makes sense regarding those three aspects of GiveWell's banking, and completely agree that our estimation methodology is likely in GiveWell's case to overestimate its average cash balance during the year. For the benefit of readers, as mentioned in our article, whether the estimate is accurate, too low, or too high will vary by charity and there is no way to increase the accuracy for an estimation methodology that works across charities due to the limitations of the Form 990 data.

Other commenters have mentioned that the federal funds rate is now close to zero. This article was primarily written before COVID-19 and the federal funds rate seemed like an appropriate and conservative benchmark at the time. I did not update the benchmark before the article was published because I received feedback from reviewers that the magnitude of the impact was large regardless of the exact interest rates. This is a sentiment that I agree with.

If the exact rate is literally 0% for the next few years (I did not intend for the federal funds rate to be used as a forward-looking estimate) that would indicate the benefit to charities is pretty low. I think a better proxy for the interest rate charities could have earned in the past and can earn now and into the future is Ally Bank's high-yield savings account rate. Ally Bank is a large institution and has over 10 years of historical interest rate data available. Their rate has historically been close to high-yield savings rates offered by most banks, and just a touch lower than the best options.

At this exact point in time, Ally Bank's rate is 0.5%. Here is the link to a historical rate chart with data since 2009: Ideally, GiveWell and other charities earning interest on U.S. dollar deposits should choose banking options that have historically earned and currently earn something close to this rate. Unfortunately, I do not think organizations can open accounts at Ally Bank at this time because they only cater to individuals, but there are many options for organizations out there that are competitive with Ally Bank's rate. We're happy to provide suggestions to GiveWell or any other organization.

As you can see from the chart, back when the federal funds rate was close to 0% after the 2008 recession, Ally Bank's interest rate hovered around 1%. That was one of the reasons my counterfactual impact estimate for GiveWell used a 1% rate. In retrospect, I should have elaborated on how I generated that estimate in the article itself.

I understand that factors like customer service, security, technology integrations, etc influence GiveWell's decision making around its banking needs. I have two thoughts on the matter.

Firstly, a high-yield savings account simply exists to maximize the yield on a nonprofit's cash, whereas a checking account accommodates most of an organization's banking needs. A checking account does not need to be selected on the basis of its interest rate, whereas this is much more important for a savings account, where an nonprofit's appropriate savings balance (e.g. most of its cash that isn't immediately needed) is stored.

Secondly, GiveWell and other charities can also select the option of having an account at a major brokerage firm such as Vanguard or Fidelity which may be more trustworthy and integrated with more options than a lesser know savings account provider (although FDIC insurance means that most regulated U.S. banking options are safe). Charities can hold these funds inside a money market account (offered by most brokerage providers as well as a lot of third parties), which is designed to not change in value, or another low-risk option. My article from last year contains more information on different options for charities, including analyzing the risk/security of both bank accounts and money market funds which you mentioned GiveWell is considering, as well as concrete guidance on selecting a brokerage account and the fund(s) to hold within it.

How You Can Counterfactually Send Millions of Dollars to EA Charities

Thanks for commenting!

First, what specific options are available? As an individual I can open a high yield savings account with Ally (or I can  refer to NerdWallet for a list of other high yield savings accounts). But If I am running an NGO I can't legally use accounts intended for individuals, right? Could you provide a list of options?

Exactly, in most jurisdictions, NGOs must create savings accounts meant for organizations. In the United States, those accounts would be called business savings accounts. In the U.K., those accounts would be called charity savings accounts, but some business savings accounts might work depending on the terms and conditions.

For the U.S., here's a link to some examples of business savings account (online sources may be somewhat biased in choosing recommendations due to affiliate links, although this source seems decent):

Second, these ideas are fairly limited to cash held in USD in the United States, right? For organizations that have operations (and thus which keep funds) in other countries and other currencies, are you able to recommend any options? I am concerned that both the lack of high yield savings accounts in those countries and the cost of international transactions would prevent organizations from using this method.

The ideas expressed here are applicable to any country that has accounts or investment options available that pay more interest than the default accounts in use by most people/organizations. This likely holds true for most/all countries that have an established financial system.

In terms of offering recommendations, it would depend on the currency and country in question. The Flagstone option I mentioned in earlier comments works for GBP, EUR, and USD (they may be limited to UK-based clients, I don't recall off the top of my head). Feel free to mention specifics in a follow-up comment or email us at I've historically researched the US, UK, and Canada, but I'll see what we can do if there's another country in question!

For countries that have less established financial systems, I agree, they may be unable to find a suitable alternative in their base currency that pays a high rate of interest, or be unwilling to take on currency risk and currency conversion costs by opening an international account likely denominated in another currency.

Besides opening an international account in USD, for instance at StoneCastle, an organization could also open an account at a brokerage firm that supports international clients like Interactive Brokers (I believe they support 19 currencies) and access various investment options. That is getting to a pretty high level of complexity though.

How You Can Counterfactually Send Millions of Dollars to EA Charities

Thanks for taking the time to list those out Steve. I downvoted your comments because while I'm very happy to engage in this type of discussion with commenters, and have with others that have commented on this article, I feel like you are jumping to conclusions that things are "incorrect" or "misleading." In fact, many of your points are already mentioned in the article itself. Additionally, you are attacking my writing by making comments like something is "naive" which I feel is not conducive to a positive and intellectual discussion about this. You'll find that I've thought out the reasoning for all of the points you mention, either in the article itself, or because it's fairly easy to understand why.

Cash balance methodology

Dividing interest earned over the year by end of year cash is not an upper bound estimate interest

In the sentence directly above this quote, I explain what I mean by upper bound: "GiveWell’s total cash and investment income in 2019 was $26,260. GiveWell held investments in 2019, so using the full amount on Line 3 to estimate GiveWell’s interest on cash in 2019 likely overestimates GiveWell’s actual interest earned on cash in 2019."

I am saying that the number overstates the interest earned on cash alone because of the confounding effect of investment income. 

It's actually more like a lower bound estimate, because it implicitly assumes that the cash level at end of year was the same as the average cash level throughout the year.

The reason why this methodology is being used is stated in this first line of the article "This methodology is easy for anyone to replicate and is based on publicly available nonprofit financial statements (IRS Form 990) that all U.S. charities are required to file yearly."

The Form 990 does not include a better estimate of an organization's average daily cash balance. This is why I am calling this an "estimation" methodology.  In the "Estimation Methodology Caveats" section I cover this and other issues in depth (and I've already mentioned this to other commenters, who also brought up this valid point). A short quote: "The average of a nonprofit’s start of year and end of year cash could noticeably underestimate or overestimate a nonprofit’s actual average cash balance during the year because it only uses two days as data points..."

Since GiveWell is a grant-making organization that's a very dangerous assumption to make (and their 990 form shows them making ~$30m in grants over the course of the year).

GiveWell is used as an example—this analysis is meant to highlight the methodology, including its shortcomings, not be a deep dive into GiveWell itself. I don't have the data needed to estimate this better. Neither you nor I know how much money GiveWell actually holds during other times of the year. They receive funds year-round and need reserves on hand to pay operational expenses.

You acknowledge this in the next section, but then propose an equally questionable workaround

That is not correct, the workaround is, as I state in the article, meant to account for the confounding effects of money made from investments rather than cash holdings by only looking at the cash balance we know isn't earning any interest. This "workaround" has nothing to do with the cash balance issue you mentioned.

The same page shows that funds received in the final three months of 2019 were substantially greater than those received in the first nine months of 2019, which is another reason that the end-of-2019 cash balance paints a misleading picture

Thanks for pointing this out. I didn't look more closely into GiveWell's specifics because GiveWell is used as an example of a methodology that generalizes to other charities as I stated in the article. Data like this is very difficult to correlate with an organization's cash balance. We don't know what percentage of GiveWell's cash balance the Maximum Impact Fund is, what the Maximum Impact Fund balance is after a grant is made, whether the "amount" column reflects all donor inflows during a specified period or also granting from reserves or other revenue sources, etc.

The year you've chosen for your analysis happens to be the year with the highest cash rates in the past 12 years.

The most recent data is most relevant to GiveWell's current and future opportunity costs.

This isn't acknowledged, and you don't backtest your strategy in other years (e.g. all the years where rates were ~0%).

That is a good point! Time did not permit, but as I stated in my reply to Rob, I do think that "to get savings accounts yields themselves, we might need to use a third-party service or design a benchmark ourselves. Given the current situation with the federal funds rate, it would make sense for us to find a better proxy for good savings accounts yields in 2020 so that we can better estimate the opportunity cost for 2020 once the 2020 Form 990s come out as well as use the rate as a point of reference for current and future expected earnings."

So it is a good idea to use an alternative metric to the federal funds rate, particularly for lower interest rate years, so they more accurately reflect the opportunity cost. Off the top of my head I think that rates were around 1% (see Ally Bank's 2015 and 2016 historical yields when the fed funds rate was 0.13% and 0.39% respectively), which is the exact same rate I used for the forward-looking estimate for GiveWell. Using savings yields from one bank or a blend of banks instead still wouldn't change the article's conclusions, given that those rates would be both higher than the federal funds rate and also significant enough to warrant consideration even in a zero interest rate environment.

Potential returns of other investment options

There's nothing about that asset that makes its one year backward-looking return able to be extrapolated. Indeed this is basically the equivalent of picking a different asset that you know now performed well over a one year period and using that to  estimate opportunity cost. Why not Bitcoin in 2017 or Tesla stock in 2020?

Exactly, why wouldn't I pick Bitcoin or Tesla? Because both ultra-short-term bonds and a standard conservative risk portfolio are extremely common investment portfolios for more risk averse investors such as many nonprofits who require a steady rate of return with minimal drawdowns. It doesn't matter what examples you use, low-risk options would have performed well during this time period and other time periods, just worse than riskier options.

Citing the one year, backward looking return of JPST is misleading

And another reason I used JPST as an example is because I recommend  JPST in my early-2019 article before I could see its historical performance. So I'm not sure if "backward looking" is the right verbiage.

And re citing a year of drawdown data - the fund had a drawdown in March 2020! If you look at a similar index with a longer timeseries you'll see there have been drawdowns, even against the backdrop of a period of secularly falling interest rates that juiced bond returns.

I already state in the article that I am quoting month-to-month drawdown data, not day-to-day data. This means the fund did not decline in value month by month. The highest historical month-to-month drawdown was -1.72% and it recovered in two months. Hardly a volatile investment.

This analysis suffers from the same problem. At least there's an attempt to look at a window longer than one year, but again it's a cherry-picked period of 20 years, and it's backward looking returns data implied to be forward-looking. You also mention the drawdown in 2018. What was the maximum drawdown in 2008 to 2009?

Given the organization is granting funds a couple of months after receiving them, it has little ability to tolerate drawdowns, making comparisons to a higher risk fund incorrect to misleading.

I did not cherry pick the time period, stocks and bonds have generally performed well across time. Portfolio Visualizer has data starting from 1987, which indicates an annual return even higher than what I quoted, at 7.07%. Maximum drawdown is -8.49% from the 2008 crash. Exactly why this is considered a standard conservative portfolio by financial professionals.

Given the organization is granting funds a couple of months after receiving them, it has little ability to tolerate drawdowns, making comparisons to a higher risk fund incorrect to misleading.

As we can see, the drawdown is very low, and the expected value is positive and significant. For granted funds that GiveWell cannot afford to have a drawdown on (this does not represent all of their funds), then a "zero-risk" option like a savings account would make more sense. It all depends on the charity. Investment examples are for illustrative purposes, I have no idea what approaches GiveWell can or cannot take in actuality, beyond a savings account, which it should be able to do.

Conclusion and staff time

As shown above, getting a counterfactual impact number in the millions of dollars is not "very likely... regardless of the estimation method". That statement is somewhere between incorrect and misleading. For instance if the cash balance is 10% of what you cite, and the interest rate is more like 0.50%, it doesn't hold up.

That depends on what numbers we're using. I think 10% is very low. As I've said, the Maximum Impact Fund cannot be used as a reliable estimate or predictor of GiveWell's average daily cash balance. But if we assume just the fund itself represents all of GiveWell's money, we can see that there's a 3-month grant collection period (averages to 1.5 months of cash at 100%) plus a 2–3 month delay in granting (averages to 2.5 months of cash at 100%) which would suggest a minimum percentage of at least 33% (4/12 months) just based on the money collected during the last three months of the year.

The staff time estimate is also somewhere between incorrect and misleading:

  • If it's just opening bank accounts, then the impact is GiveWell on average earning roughly the prevailing bank interest rate (close to zero for much of the relevant period)
  • If instead you want them (without the benefit of hindsight that you employ) picking actively managed JP Morgan bond funds, or creating and balancing a bond + stock fund, then I'd hazard it's more than two hours of work per year!
  • So either it's not much effort, and not much return, or there can be higher returns, but clearly it's more than 2 hours a year of effort.

This is probably evident from the rest of my replies, but a 1% account savings rate or even 0.5% still produces significant financial returns. These numbers should be used instead of 0%.

And it would take a very small amount of time to keep funds in one fund for multiple years, whether that's JPST or a multi-asset fund that has, say, a 20% stock allocation and 80% bond allocation. Vanguard, a well-known and trusted provider, has a great ultra-short-term bond fund as a JPST alternative. A nonprofit might not maximize returns by shifting between funds on the reg (which is, as you say, time consuming, although Antigravity Investments is more than happy to help with that), but evidently they will do much better than nothing. Many nonprofits self-manage their investment approach.

How You Can Counterfactually Send Millions of Dollars to EA Charities

This article makes several statements that I interpret as somewhere between intentionally misleading and outright incorrect.

Could you list out those statements? Are you talking about the article, or my comments? I would certainly not want to intentionally mislead, nor be outright incorrect.

For instance, this reply says the 2.19% Fed Funds rate was the prevailing rate in 2019, and isn't intended to be a forecast of the future. But since we know the Fed Funds rate is 0% today, why would that rate be used to argue for a forward-looking change in behavior?

As I state in the introduction, "In this section, we will introduce our cash interest opportunity cost estimation methodology for U.S. 501(c)(3) charities." The majority of this article is about open sourcing the estimation methodology we developed, which took considerable effort over multiple years. We analyzed financial data across over 300,000 nonprofits and ran the methodology past the IRS and an independent accountant. This methodology was not designed to forecast future opportunity costs, and doing so seemed especially unnecessary in the pre-COVID-19 environment of rising interest rates that we originally developed the methodology in.

As you can see by the dollar amount of the $4 million dollar forward-looking estimate for GiveWell (based on a 1% interest rate), the interest rate does not need to be 2% for this recommendation to make sense. Current bank yields are 0.5%, so if we assume that's the case for the next five years, the five-year benefit is $2 million instead. Given that the implementation time is, say, a conservative 20 hours, the associated staff time cost might be 20 * $100 = $2,000. Should GiveWell spend $2,000 to make $2,000,000? That's a 1000x ROI.

Part of the reason why the article was mostly about my estimation methodology is because the exact forward-looking numbers don't change the conclusions of the article.

So assuming an organization needed to make a grant within 12 moths, they could currently expect to make 0.10% on their cash balance. Needless to say this is 1/10th of 1%, or <1/20th of the figure cited in the post. And it seems a stretch to assume organizations hold cash for 12 months before granting it. So the likely benefit is perhaps at best 1/10th and potentially <1/100th of what's cited here.

You are citing numbers for an unappealing option to store cash in, and using that to argue that that's the best that organizations can do. Furthermore, you're doing this after I already mentioned bank interest rates of 0.5%+ in my reply to Rob that you are replying to. A quick Google search indicates that there are lower risk options (business savings accounts) that yield 0.5% and upwards. I have no idea why you are quoting a 0.10% figure.

You may not be understanding what the article means by "cash balance." As I make very clear in the article, we are using the organization's estimated average daily cash balance to calculate the historical and future opportunity costs. The average daily cash balance is the amount that an organization literally makes interest on; I can't think of a better number to use to calculate the interest an organization previously made and could be making in the future. All organizations have a cash balance, which we can say is the amount of cash in their checking and/or savings accounts, that they regularly make grants out of. As you can see from the historical opportunity cost estimation, clearly organizations have cash reserves on hand, and clearly those cash reserves could be earning more interest than they are now, regardless of whether or how they make grants.

How You Can Counterfactually Send Millions of Dollars to EA Charities

Thanks for your thoughtful reply Rob!

"The 2.16% U.S. federal funds rate in 2019 is one of the most conservative interest rates possible."

The U.S. Federal Funds rate has been effectively 0% since April 2020 and was roughly 0% for six years from 2009 to 2015. The same is roughly true of the UK. Central banks in both countries are saying they'll keep rates low for years to come.

I can't immediately find a reputable business savings accounts in the UK/US that currently offers more than 1%.

To quote my reply to GMcGowan, "We used the latest Form 990 data from 2018 and 2019 and the associated interest rates from those years to calculate the prior-year opportunity costs as accurately as possible, which is a separate calculation than estimating the forward-looking counterfactual impact." In other words, the 2.16% is meant to be a conservative rate of interest a charity could earn by holding cash in a respectable savings account in 2019 rather than a forward-looking projection.

The federal funds rate is a good rate to use for historical analysis because we have very granular data for what it is in the past, whereas to get savings accounts yields themselves, we might need to use a third-party service or design a benchmark ourselves. Given the current situation with the federal funds rate, it would make sense for us to find a better proxy for good savings accounts yields in 2020 so that we can better estimate the opportunity cost for 2020 once the 2020 Form 990s come out as well as use the rate as a point of reference for current and future expected earnings.

I think the recommendation in this article is timeless, so the specific numbers don't matter that much. In fact, if the interest rates are lower, organizations are even less likely to do this, so the counterfactual impact decreases along the lines of expected interest increase but increases with the timeframe of impact before the organization would have otherwise implemented these changes.

In the "estimating counterfactual impact" section of this article, I use a 1% average improvement over the next five years to estimate GiveWell's opportunity cost over the next five years rather than, say, 2.16%. Right now, the rates are below 1% as you say. I see savings account options around the 0.5% and 0.6% range in both the US and the UK, although they've been higher earlier this year even after COVID-19.

You mention challenges with opening and managing bank accounts like: 

"I can't immediately find a reputable business savings accounts in the UK/US that currently offers more than 1%"

"These accounts usually offer a high rate to attract customers for a while, then dramatically reduce the interest rate"

"Opening bank accounts for non-profits, at least in the UK, is a pain."

"It looks like you usually won't be able to put in more than a million dollars/pounds in any given account, often less."

"keep track of them, secure the chequebooks, have them audited annually, integrate them into your bookkeeping system, change the signatures when staff turn over, figure out the idiosyncratic requirements to pull out money when you need to"

I have three responses. First, given the magnitude of the opportunity costs involved, most organizations with significant cash holdings should do this since the benefit is greater than the operational complexity (maybe a higher cash threshold for organizations wanting to hold money in UK banks). All organizations mentioned in the table have cash holdings of over $1,000,000.

Second, I think you've articulated some great reasons why Antigravity Investments should exist! On the surface, it might appear challenging to solve this problem, so having one person or organization figure this out and make the recommendation to multiple organizations and help with implementation as needed seems like a much more efficient model compared to having operations/finance team members at each organization relying on their preconceived notions to evaluate the benefits of this, plus needing to figure out the implementation component all by themselves.

Third, because Antigravity Investments exists, the EA community is now aware that there are institutional cash management solutions that overcome the challenges you mentioned. While it's better to directly contact Antigravity Investments for our latest recommendations, I wrote a DIY guide to institutional cash management in my  2019 EA Forum article (which is the solution to the opportunity cost problem mentioned in this forum post, although slightly outdated).

I've mostly been focusing on the United States and business savings accounts seem easier to open here. However, it so happens that I have done some preliminary exploration for the UK where you seem to have more experience with dealing with bank accounts. I'll mention several solutions, which address all of the concerns you mentioned.

In my original article, I mention a service called StoneCastle: "Our recommended solution is StoneCastle’s AAA-rated Federally Insured Cash Account (FICA). FICA works by continually analyzing yields at hundreds of U.S. banks and automatically storing cash at each high-yield bank up to the $250,000 FDIC insurance limit." Basically, you open one account, and that one account automatically optimizes the yield across hundreds of banks. The application is a very short PDF that can be filled out and submitted quickly and completely digitally. StoneCastle is open to international clients that want to store funds in USD.

As I mention in a comment on my 2019 article, "We're in the process of investigating options in the UK. Right now, Flagstone looks very promising, particularly for charities and large account sizes."

Flagstone is a somewhat similar service to StoneCastle but for UK cash deposits. It allows charities to open a single account and gain access to the best rates across (as of the time of writing) 45 partner banks. Unlike StoneCastle, money isn't moved automatically, but it can be moved at the click of a button. Flagstone appears to overcome the discovering reputable banks problem, the interest rate teaser problem, the switching bank accounts to get the highest yield problem, the account maximum balance problem, and the complexities of managing multiple accounts problem that you mentioned.

As mentioned in my original article and briefly in this article, storing money in ultra-short-term bonds or other investments is another good approach. Then, there's only a single brokerage account, and no bank-related complexity. Options like ultra-short-term bonds are safe relative to other investment options and also have a higher expected yield than savings accounts. Organizations can manage a brokerage account with a DIY approach, which could be as simple as making a couple-minute trade in a brokerage account every few months, or have an external service (like us) handle that.

How You Can Counterfactually Send Millions of Dollars to EA Charities

I have not received a response from GiveWell staff members I've cold emailed in the past, but I have consistently received responses from This makes me think that is a good choice.

I believe the detailed documentation of GiveWell's opportunity cost in this article makes it likely (85%) that GiveWell will respond to this inquiry or a follow-up email within two months. Hopefully they forward the inquiry to the appropriate team members.

I anticipate that the main failure mode of email outreach is that GiveWell indicates they intend to take action but does not do so in a timely manner (within six months), or isn't transparent regarding cash management improvements they say they've made in the past or intend to make in the future. In the latter case, the lack of transparency makes it difficult to determine the effectiveness of GiveWell improvements relative to the best possible interest rate until new Form 990s are released, which will be mid-2022 at the earliest for the 2021 Form 990. As an interest rate reference point, Axos Bank, which I mentioned in my talk earlier this year, is paying a 0.50% rate of interest right now.

I believe that it is difficult to mitigate risks associated with this failure mode without some way to increase GiveWell's trust in this recommendation or influence/get more time to speak with the appropriate decision makers. To date I have not found someone that can help with this, so I think a cold email is most appropriate in this case.

My email is as follows:


Subject: EA Forum Article About GiveWell

Dear GiveWell,

I wanted to share an EA Forum article I recently published about the opportunity costs of GiveWell's current approach to cash management. A rough estimate puts GiveWell's opportunity cost at $4 million over the next five years. Excluding deliberation time, I believe it will take under 10 hours for GiveWell to implement the change the article recommends.

It would be great to know if GiveWell has or intends to make changes, as well as the change that was made/how much interest it is currently paying relative to the best business savings accounts. My outreach to GiveWell is being publicly tracked in the action thread of the article, which is an experiment around leveraging the EA Forum to drive institutional behavior change.



How You Can Counterfactually Send Millions of Dollars to EA Charities


This is the first post in the action thread which I hope will be a good model for anyone that would like to try posting in this thread in the future. I hope that the action thread in general will be a good experiment for the EA Forum.

As documented in this article, I estimate GiveWell's five-year opportunity cost at $4 million. This is a very rough estimate which is dependent on many factors including GiveWell's true past and future cash balances. GiveWell's Form 990 makes it pretty clear they can benefit from this recommendation because they are earning a very small amount of interest income per year, even if their cash balances during the year are considerably lower than the year-end balances in Form 990.

How You Can Counterfactually Send Millions of Dollars to EA Charities

Thanks for sharing your thoughts!

For point 1, I mention this in more detail in my response to GMcGowan—the 2.16% federal funds rate in 2019 was in fact a conservative estimate for bank yields. That can be seen by looking at my EA Forum article from 2019 which references bank savings yields of up to 2.4%. The accounts that offer a higher rate of interest (like the 2.4% accounts) do not fluctuate like bonds and have identical risk to other savings accounts because they’re all insured by the FDIC. They yield less in 2020, of course. I perform a more in-depth risk analysis of savings accounts and alternative options in my article from 2019.

Regarding point 2, if we include 2% estimated inflation, then bonds would return 1% and a low-interest charity savings account would return -2%. If we adjust your estimates upwards to include inflation like my 5.51% figure, so 7% for equities and 3% for bonds, we get 3.8% (likely higher, say 4%, with rebalancing). Would you say that’s within the same ballpark? Regardless, I think future returns are very difficult to forecast, even with good causal explanations. With those assumptions, it would make sense to allocate more of the portfolio to stocks instead.

Regarding point 3, yep, that’s a shortcoming of solely relying on Form 990 data. If we had the full data, I think it’s unlikely that would change the numbers by that much (say more than 50% higher or lower). I talk about this and other estimation issues in the “Estimation Methodology Caveats” section of the article.

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