Meta Decision Theory and Newcomb's Problem

5 wdmacaskill 05 March 2013 01:29AM

Hi all,

As part of my PhD I've written a paper developing a new approach to decision theory that I call Meta Decision Theory. The idea is that decision theory should take into account decision-theoretic uncertainty as well as empirical uncertainty, and that, once we acknowledge this, we can explain some puzzles to do with Newcomb problems, and can come up with new arguments to adjudicate the causal vs evidential debate. Nozick raised this idea of taking decision-theoretic uncertainty into account, but he did not defend the idea at length, and did not discuss implications of the idea.

I'm not yet happy to post this paper publicly, so I'll just write a short abstract of the paper below. However, I would appreciate written comments on the paper. If you'd like to read it and/or comment on it, please e-mail me at will dot crouch at 80000hours.org. And, of course, comments in the thread on the idea sketched below are also welcome.

 

Abstract

First, I show that our judgments concerning Newcomb problems are stakes-sensitive. By altering the relative amounts of value in  the transparent box and the opaque box, one can construct situations in which one should clearly one-box, and one can construct situations in which one should clearly two-box. A plausible explanation of this phenomenon is that our intuitive judgments are sensitive to decision-theoretic uncertainty as well as empirical uncertainty: if the stakes are very high for evidential decision theory (EDT) but not for Causal Decision theory (CDT) then we go with EDT's recommendation, and vice-versa for CDT over EDT.

Second, I show that, if we 'go meta' and take decision-theoretic uncertainty into account, we can get the right answer in both the Smoking Lesion case and the Psychopath Button case.

Third, I distinguish Causal MDT (CMDT) and Evidential MDT (EMDT). I look at what I consider to be the two strongest arguments in favour of EDT, and show that these arguments do not work at the meta level. First, I consider the argument that EDT gets the right answer in certain cases. In response to this, I show that one only needs to have small credence in EDT in order to get the right answer in such cases. The second is the "Why Ain'cha Rich?" argument. In response to this, I give a case where EMDT recommends two-boxing, even though two-boxing has a lower average return than one-boxing.

Fourth, I respond to objections. First, I consider and reject alternative explanations of the stakes-sensitivity of our judgments about particular cases, including Nozick's explanation. Second, I consider the worry that 'going meta' leads one into a vicious regress. I accept that there is a regress, but argue that the regress is non-vicious.

In an appendix, I give an axiomatisation of CMDT.

Responses to questions on donating to 80k, GWWC, EAA and LYCS

27 wdmacaskill 20 November 2012 10:41PM

Giles, and some others, have asked questions about donating to one or more of CEA’s sub-organisations. In what follows, I address these questions. I felt it would be clearest for me to mainly cluster questions under general headings, rather than address the specific wording of every question. (Note: thanks to help from Ben Todd on this!)

A couple of clarifications

Centre for Effective Altruism is a legal entity that comprises 4 organisations: Giving What We Can, 80,000 Hours, Effective Animal Activism, and The Life You Can Save. EAA is formally still a sub-project of 80,000 Hours, but should be thought of as separate for accounting purposes and may well become a separate organisation. In the previous blog post I talked about GWWC and 80k only, but because there’s been interest, here I’ll discuss the other two as well, albeit more briefly.

Some numbers follow. These are true as of Nov 20th 2012 (or, rather, are best estimates as of that date), but are very likely to change in the near future. They should therefore be taken as illustrations merely.

Finally, because all the organisations that comprise CEA are young, there are certain policy issues that still have not been decided upon; and some that have been decided upon may change in the near future as we learn. Where possible, I have tried to flag which policies are as yet undecided.

What’s your expenditure?

Below are rough estimates for expenditure from start Q2 2012 (when we first took staff) until end Q4 2013 (our short-term fundraising horizon). All numbers are in thousands.

80k (basic): £118.8 = ~$190

80k (inc. some expansion): £139.1 = ~$220

GWWC (basic): £87.4 = ~$140

GWWC (inc. some expansion): £107.7 = ~$170

LYCS (basic): £47.88 = ~$76

EAA (basic): £32.76 = ~$52

The large majority of our expenditure is on staff. 80k (basic) comprises one full-time staff member from Q2 2012, two staff members working 0.4 time from Q2 2012, and one full-time staff member from Q1 2013. GWWC (basic) comprises one 5/8 staff member from Q2 2012, and two staff members working 0.6 time from Q2 2012. LYCS (basic) comprises one full-time staff member from Q2 2013, and some money earmarked for on-line marketing by one funder. EAA (basic) comprises one full-time staff member from Q1 2013. Across CEA, we typically employ one intern-year for every employee-year.

For both GWWC and 80k, the difference between the ‘basic’ scenario and the ‘expansion’ scenario is that we would hire one additional person from Q3 2013, and employ one additional intern-year for 2013. The ‘expansion’ scenario indicates a cautious limit on our use for more funding; though it certainly seems to us that we could spend money well above that amount, we would need to discuss whether it could be detrimental in the long-run for the organisations to grow that fast. We could very comfortably spend within the ‘expansion’ scenario, and would feel hindered if we were not able to spend up to that amount.

Each employee is paid a starting salary of £18 per annum, significantly below market rates for graduates even within the not-for-profit world, and without accounting for the fact that our employees are significantly more qualified than the average graduate. Interns are unpaid, but are typically given expenses. A significant proportion of our labour is still voluntary.

What’s your income? What’s your shortfall?

All numbers are now in $000s. I'll measure 'shortfall' relative to the 'basic' budget. The fundraising numbers below include both income that we have already received and income that we expect to receive, discounted according to a conservative estimate of its likelihood (50%). I’ll assume that CEA unrestricted money is divided as follows: 0.4 to 80k, 0.4 to GWWC, 0.12 to LYCS and 0.08 to EAA. (This division does not represent a policy about how we divide unrestricted funds. Currently that policy is not yet determined, so I’ve chosen these numbers as illustrative. More on use of unrestricted money in “earmarking and fungibility” below.)

80k raised: 85.1. Shortfall = 190 - 85.1 = ~$105

GWWC raised: 117.9. Shortfall = 140 – 117.9 = ~$22

LYCS raised: 63.4. Shortfall = 76 – 63.4 = ~$12.5

EAA raised: 27.2. Shortfall = 52 – 27.2 = ~$25

For both GWWC and 80k, to get the shortfall for the 'expansion' budget – which represents spending which we could easily accommodate without sacrificing quality of work —  add 30 to the 'shortfall' number.

How would you spend additional money?

As the numbers above suggest, in most cases additional donations would be spent on basic costs — principally, paying staff — over 2013. If GWWC or 80k exceeded their ‘basic’ budget, then additional money would be put towards on their ‘additional’ budget: principally, hiring one new staff member each.  The desired marginal hire for GWWC is a Communications Director.  The desired marginal hire for 80,000 Hours is a Careers Researcher and Adviser.

Where’s that income from?

Our donations come from a variety of sources. Private donors, of varying degrees of wealth, make up the large majority of our income. GWWC has received a grant from one foundation. The majority of donations come from within the effective giving community, though a sizable proportion comes from outside that community and we’re actively pursuing further leads there, including high net worths. If we ever had a significant donation commitment that used up our room for more funding, we’d let other donors know immediately.

Room for More Funding, and a Co-ordination Problem

Suppose that, within the effective giving community, there is $N that people would want to donate to CEA, conditional on CEA having room for more funding. But CEA only had room for $M, where M<N. Every giver thinks, “well, CEA is going to reach its room or more funding anyway. So there’s no reason why I should given.” So no-one gives to CEA. That would be a bad outcome on our part. Alternatively, perhaps every giver thinks, “well, I’ll just give to CEA anyway”. So CEA receives $N, whereas it can only spend $M well, and there is an $N-$M excess. That would be a bad outcome on the part of the giver. So what’s the solution?

One solution to that problem (though I haven't thought about it that much) is as follows: we decide upon a funding limit for each organisation. We say that if we receive donations above that limit (before a designated time), we will donate the excess to the most cost-effective charities. Different givers think that different causes are the most important, so we’ll donate to the different cause areas depending on what proportion of CEA donations would have been given to those causes if they hadn’t been donated to CEA. So if we received 70% of donations that would have been donated to global poverty, we’ll give 70% of the excess to AMF; similarly for animal welfare and x-risk.

The advantages of this are as follows. It safeguards against CEA having less money than it needs because of the co-ordination problem. It ensures that givers can donate to CEA while knowing that the money won’t be spent on CEA above its room for more funding. It’s also what GiveWell does, and insofar as GW appear to us to be a very well-run organisation, it’s worth imitating them.

What are the alternative solutions? Well, we could bank the money and use it the following year. So the excess money donated to CEA is used one year later than the giver might have expected, and we spend less time on fundraising for the following year. Or we could go ‘first come first served’: we keep accepting donations until we hit our RFMF. I think that the latter suggestion is a bad one. The former is potentially good I think, and simple, and I’m open to comments on which solution potential donors think is preferable.

Different Cause Areas

GWWC and LYCS are focused on global poverty, and have no plans to change that. EAA is focused on animal welfare. 80,000 Hours is open to any plausibly high-impact activity. There is currently no organisation within CEA dedicated purely to x-risk mitigation, but, given demand, it’s not unlikely that one will be created in the mid-term future.

“Earmarking” and Fungibility

Some comments mentioned “earmarking”. I think that’s a misleading term in this context. “Earmarking” normally refers to donations that are tied to a specific activity. Whereas, when one donates to GWWC, the donation is not tied to a specific activity. CEA shouldn’t be thought of as an organization over and above the four organisations.

We actively encourage donations that are restricted to one organization only, if you think that one organization is more cost-effective than the others. In order to avoid the fungibility problem, I considered asking only for restricted donations. It seems to me on balance that the costs of this policy outweigh the benefits, but I’m not sure.

My current preferred solution is as follows. Every 6 months, after the reviews of each organization (see next section), the trustees decide how to allocate unrestricted funding. The default they use is that unrestricted funding is allocated in proportion with restricted funding. If this default holds — either exactly or approximately — then fungibility of donations is not an issue. In fact, if the default holds, then fungibility is negative: donating $1 to GWWC would move slightly more than $1 to GWWC, because it would also increase the proportion of CEA unrestricted money that it receives. The trustees deviate from this default if there are compelling reasons for doing so (e.g. a major donor for one organization unexpectedly drops out, rendering basic expenditure uncertain). In the long run (and ex ante), we wouldn’t expect these deviations to favour one organization over another, so, in the long run (and ex ante), fungibiltiy is again not an issue. Moreover, from this arrangement we would expect each organization to benefit in terms of financial stability and from the success of their sister organisations.

Self-Evaluation and Impact Assessment

I’ll describe 80k’s process. GWWC’s is very similar.

Every 6 months, 80k will have to write a report of its progress over the last 6 months, including achievements and failures, how its progress compares to the goals stated 6 months ago, and write concrete, measurable goals for the next 6 months. This report will then be reviewed by two boards. The trustees of CEA: myself, Nick Beckstead, and Toby Ord. And an "Advisory Committee", consisting of 80k supporters (and often donors) who aren't in any way involved with the running of 80k. The Executive Director of 80k (and one or two others) will meet with these boards, and they'll discuss the report. Each board will write a summary of conclusions. All three documents (initial report, and two commentaries from the boards) will be posted on the blog.

Every year (probably in spring or early summer - a quiet time for us), we'll complete a more in-depth impact-evaluation, at least in terms of money moved, person-hours moved, money pledged and person-hours pledged. All-year round, we measure progress with respect to pre-chosen goals. The ED of 80k sends progress reports to the 80k team every week. Currently, because marketing and recruitment are our key priorities, our principal metrics are number of new members per week, % of members who say that they’ve changed their career plans because of 80k, income pledged per member, unique visitors to the website, and number of advising sessions given.

Miscellaneous CEA Questions

Which is more useful, regular donations or lump sums?

Either is good. Most charities prefer regular donations because people are likely to give more that way (they forget about the direct debit). But I'd rather you were giving on the basis of perceived cost-effectiveness, rather than status quo bias! Financial forecasting is really important for us, though, so if it's lump sums, we really appreciate knowing the chance they'll be repeated in future years. And we have a steep discount rate (perhaps 20%?) so we greatly prefer money sooner rather than later.

If you had funds to hire an extra person, do you know how that person would be? How important is it to find talented people to work for you?  Are you trying to find someone from the top 5%? The top 1%?

It's difficult to give a meaningful reply to that — 1% in terms of general ability, or fit for us? I'll answer for 'general ability' (whatever that means).  We're generally selecting only from top universities, which filters out a large majority of the population. As an approximation (but merely a very rough approximation): There are roughly 772,000 18 yr olds in the UK, of which 7000 go to Oxford or Cambridge. We mainly select from those universities (or equivalent standard elsewhere), so that already filters out 99% of the population.

Within such universities, we normally recruit very high-performing graduates — perhaps in the top 10% or 5%. Which would suggest that we're recruiting from the top 0.1% from the population. But, like I say, I'm not sure that that number is that meaningful. I'm not certain why, but we do seem to be able to recruit exceptionally talented people. (Like Niel, who's starting with us from January).

How much personal connection and communication is there between CEA and these orgs?
- THINK
- Global Catastrophic Risk Institute
- Center for Applied Rationality
- Future of Humanity Institute
- GiveWell


Lots. Mark Lee, founder of THINK, came through GWWC. I gave a talk for the Brown THINK chapter the other day, and helped their co-President with plans for the year. We've met a couple of times with Seth Baum. We know Julia and Anna well, and support CFAR. Toby Ord (a trustee of CEA) is a research associate at FHI, and Will participates in FHI events. We're in regular contact with GiveWell. A core CEA volunteer is considering working for them.

I could say much more, but it would get long-winded. We support all the above organisations, and aim to co-ordinate with them all, so that we don't get in each others' way, and can help each other out.

Where do you see the delineation between what CEA does and what other effective altruist orgs do?

We worry a lot about needlessly doubling up on or competing with work done by other effective altruist organisations. Taking our four organisations in turn:

GWWC: Along with LYCS, the only group in the world promoting major individual cost-effective giving. Does charity effectiveness research, but only where we think we can usefully add to what Givewell does.

80k: The only effective altruist organisation doing careers advice. The most broad focused effective altruist organisation except for THINK, but we’re distinct from THINK in that we provide careers advice through web content and one-on-one sessions rather than setting up meet-ups.

EAA: The only animal focused effective altruist organisation (EAA is effectively doing what 80k would have done in this area, except we thought it was useful to give it separate branding.

TLYCS: Similar in aims to GWWC, but lower-bar entry for most members. Planning different outreach routes

What are you planning in the way of financial transparency?

We'll publish an annual financial report, with a breakdown of costs. We’d like to be able to regularly explain room for more funding (etc.) as we do above, but doing so uses considerable time of high-level people within the organization, so we can’t promise that.  In general, we take GiveWell as a model organisation, and will often emulate their practices.

Miscellaneous GWWC Question

You said in your LW post that you have "much more information available" on GWWC's impact.

Yes. If you email me (will [dot] crouch [at] 80000hours.org), you can see the calculations by which we estimated GWWC’s impact.

Miscellaneous 80k Questions

You do a bunch of different but related things - website content, speaker events, career counseling,
- Do you imagine yourself specialising in just one of these in the future?
- Are you at the stage of experimenting to find out which activity is the most effective?
- Is there synergy between them? (e.g. if career advice sessions and website content are both a lot more effective if you're also doing the other one)


We’re creating a new type of organisation, and there’s a great deal we don’t know. We see our priority as testing these different approaches and improving them. Having a basket of methods lets us gain more information, and prevents us from stalling if one method turns out not to work.

For each method, we track a bunch of metrics which ultimately relate to our bottom line: resources shifted to the most effective causes that wouldn’t have been shifted otherwise. We propose tests for ways to improve these metrics. If our hypotheses about what we expect to work are disconfirmed, we change our approach. Otherwise, we move to scale up the method.

Whether we end up specialising, therefore, depends on whether one of the methods ends up being significantly more effective than the rest. And whatever happens, since we’re constantly seeking to improve, I imagine we’ll always be experimenting with new processes.

At the moment, we broadly see the web content and one-on-one advice as our most important services, and we’re expecting to scale them the most (though there’s a lot of flexibility within where we take these). We pursue some lectures, especially in Oxford, since they have high marginal returns, but we don’t currently expect to scale them. We’re exploring some other methods, but have not tested them yet.

I have very little idea about what the 80K community is like or how exactly you invest in it
- in what ways does your team interact with your community, other than one-on-one career advice and hosting speaker events?
- do you invest in members' skills such as critical thinking and the ability to evaluate organisations?
- what other skills and qualities do you want to develop in your members, and how do you plan to go about it?
- to what extent do you think talents and abilities are inherent (or at least beyond your control), and to what extent are they trainable?


Probably one of the most useful things we do is forge links between people in the community who can help each other out. For instance, we’ve introducing people who have successfully navigated applications to finance jobs to others who want to do the same. We brought together a bunch of people interested in the animal cause to set up EAA. We’ve introduced people who are in the same research field. At the minute, this mainly happens via personal introductions, but we’re developing tools to make this easier online.
Besides this, the team interacts with the community via the members’ googlegroup and our online discussion forum, 80000hours.org/discussion.

Our current focus in our providing our members with really useful information about which career they should enter in order to have the most impact. Our main way of improving their skills is by introducing them to mentors. We also sometimes coach people through tough career stages in our one-on-one advice (e.g. we recently helped get one of our interns a Marshall scholarship). Longer term, we might switch to have a greater focus on self-improvement, but that niche has a lot more competition (e.g. if you care about becoming more rational, go to Less Wrong).

Is 80K planning activity in any new physical locations?
- If so, where?
- If there's already a THINK community in that location, what do you imagine the relationship between THINK and 80K looking like?

We encourage any 80k members who’d like to start an 80k meet-up to do so, and we’ll happily give them advice and support; but we don’t plan to invest significant staff time in setting up new physical locations. This is because our current focus is on our web content and one-on-one advice. The exception is that we’d like to intensify existing involvement in Oxford, Yale and Princeton, which we see as test grounds and already have some infrastructure.

We could easily change our minds, however, and we’re pretty interested in the idea of doing a lecture tour (which we could support with the web content and one-on-one advice).  We wouldn’t set up an 80k presence in a new location, as opposed to sending people to THINK, unless we thought that there was good reason that having two organisations in the area would be more effective.

There's apparently a lot of interest in x-risk among 80K members. Do you know why this is?

I think that the 34% is higher than the percentage of x-risk concerned members in the long-run (which I'd guess will end up at about 10%), due to initial selection effects (we got quite a few members from the x-risk network, and others who would have been GWWC members were if not for the fact that they were principally concerned about x-risk). However, there does seem to be a strong positive correlation between how dedicated members are, and whether they are concerned by x-risk. And we haven’t yet really discussed x-risk as a cause area. So it’s difficult to say what proportion of resources we generate will be x-risk focused.

A number of people are convinced by x-risk but just don't think that there currently exists a good enough giving opportunity. So the proportion would increase considerably if a really clear x-risk giving opportunity arose (e.g. if GW ever recommended an x-risk org).

Do you know of any other organisations that do anything similar to what you do? (other than ones I've already mentioned). In particular any groups that give career advice to philanthropists.

As far as we can tell, there’s no-one else providing careers advice focused on how you can make a difference. All that exists is informal advice about impact given by friends and within other effective altruist communities (e.g. LW, GWWC).
Making a difference aside, it seems like the average quality of careers advice in general is pretty low, and rarely evidence-based or aware of decision making biases.

From several perspectives, we think we’re in a very interesting market niche. As far as philanthropy goes, there are some groups focused on fostering it e.g. http://youngphilanthropy.org.uk/, but they tend to have little focus on effectiveness.

Miscellaneous EAA Questions

What are the plans for EAA? When will it be spun off? Is there much interest in it from new members of 80k? Is anybody other than Eitan Fischer (who's in school) working on it at the moment?

EAA is taking on a full-time Executive Director some time between Jan and Sept. The initial priorities will be scaling up the charity effectiveness research, taking it to major philanthropists and fundraising. If EAA achieves enough scale, we’ll promote it to a full member of CEA.

Around 10-20% of our new members are interested in the animal cause (and we haven’t promoted it much directly, beyond a couple of blog posts). They tend to make use of EAA. Eitan has a small team of volunteers and advisers helping him out part-time. There’s probably about 4-8 people involved in some capacity at most times. This should increase significantly once we recruit an Executive Director.

Giving What We Can, 80,000 Hours, and Meta-Charity

44 wdmacaskill 15 November 2012 08:34PM

Disclaimer: I’m somewhat nervous about posting this, for fear of down-voting on my first LW post, given that this post explicitly talks in a positive light about organisations that I have helped to set up. But I think that the topic is of interest to LW-ers, and I’m hoping to start a rational discussion. So here it goes…

Hi all,

Optimal philanthropy is a common discussion topic on LW. It’s also previously been discussed whether ‘meta-charities’ like GiveWell — that is, charities that attempt to move money to other charities, or assess the effectiveness of other charities — might end up themselves being excellent or even optimal giving opportunities.

Partly on the basis of the potentially high cost-effectiveness of meta-charity, I have co-founded two such charities: Giving What We Can and 80,000 Hours. Both are now open to taking donations (info here for GWWC and here for 80k). In what follows I’ll explain why one might think of Giving What We Can or 80,000 Hours as a good giving opportunity. It’s of course very awkward to talk about the reasons in favour of donating to one’s own organization, and the risk of bias is obvious, so I’ll just briefly describe the basic argument, and then leave the rest for discussion. I hope I manage to give an honest picture, rather than just pitching my own favourite idea: we really want to do the most good that we can with marginal resources, so if LW members think that giving to meta-charity in general, or GWWC or 80k in particular, is a bad idea, that’s important for us to know. So please don’t be shy in raising comments, questions, or criticism. If you find yourself being critical, please try to suggest ways in which GWWC or 80k could either change its activities or provide more information such that your criticisms would be addressed.

What is Giving What We Can?

Giving What We Can encourages people to give more and to give more effectively to causes that fight poverty in the developing world.  It encourages people to become a member of the organisation and pledge to give at least 10% of their income to the charities that best fight extreme poverty, and it provides information on its website about how people can give as cost-effectively as possible.

What is 80,000 Hours?

80,000 Hours provides evidence-based advice on careers aiming to make a difference, through its website and through on-one-one advice sessions. It encourages people to use their careers in an effective way to make the world a significantly better place, and aims to help its members to be more successful in their chosen careers. It provides a community and network for those convinced by its ideas.

What are the main differences between the two?

The primary differences are that 80,000 Hours focuses on how you should spend your time (especially which career you should choose), whereas Giving What We Can focuses on how you should spend your money. Giving What We Can is focused on global poverty, whereas 80,000 Hours is open to any plausibly high-impact cause.

Why should I give to either?

The basic idea is that each of the organisations generates a multiplier on one’s donations. By giving $1 to Giving What We Can to fundraise for the best global poverty charities, one ultimately moves significantly more than $1 to the best global poverty charities.  By giving $1 to 80,000 Hours to improve the effectiveness of students’ career paths, one ultimately moves significantly more than $1’s worth of human and financial resources to a range of high-impact causes, including global poverty, animal welfare improvement, and existential risk mitigation.

How are you testing this?

Last March we did an impact assessment for Giving What We Can. Some more info is available here, and I can provide much more information, including the calculations, upon request. As of last March, we’d invested $170 000’s worth of volunteer time into Giving What We Can, and had moved $1.7 million to GiveWell or GWWC top-recommended development charities, and raised a further $68 million in pledged donations.  Taking into account the facts that some proportion of this would have been given anyway, there will be some member attrition, and not all donations will go to the very best charities (and using data for all these factors when possible), we estimate that we had raised $8 in realised donations and $130 in future donations for every $1’s worth of volunteer time invested in Giving What We Can. We will continue with such impact assessments, most likely on an annual basis.

We have less data available for 80,000 Hours, but things seem if anything more promising. A preliminary investigation (data from 26 members, last May) suggested that the average member was pledging $1mn; 34% of were planning to donate to existential risk mitigation, 61% to global poverty reduction. Member recruitment currently stands at roughly one per day. 25% of our members state that their career has been ‘significantly changed’ by 80,000 Hours. A little more information is available here.

Why might I be unconvinced?

Here are a few considerations that I think are important (and of course that’s not to say there aren’t others).

First, the whole idea of meta-charity is new, and therefore not as robustly tested as other activities. Even if you find the idea of meta-charity compelling, you could plausibly reason that most compelling arguments to new and optimistic conclusions have been false in the past, an so on inductive grounds treat this one with suspicion.

Second, you might have a very high discount rate. Giving $1 to either GWWC or 80k generates benefits in the future. So working out its cost-effectiveness involves an estimate of how one should value future donations versus donations now. That’s a tricky question to answer, and if you have a high enough discount rate, then the investment won’t be worth it.

Third, you might just think that other organisations are better. You might think that other organisations are better at resource-generation (even if that’s not their declared aim). Or you might think that it’s better just to focus on more direct means of making an impact.

Finally, you might just have a prior against the idea that one can get a significant multiplier on one’s donations to top charities. (One might ask: if the idea of meta-charity is so good, why don’t many more meta-charities exist than currently do?) So you might need to see a lot more hard data (perhaps verified by independent sources) before being convinced.