# 0. Introduction

In this post I describe a simple institution for altruistic funding and decision-making, characterized by the creation and exchange of "certificates of impact." I’m interested in your thoughts and criticisms.

Typically an effectiveness-minded altruist would try to do as much good as possible. Instead, users of the certificates system try to collect certificates for as much good as possible.

Whenever anyone does anything, they can declare themselves to own an associated certificate of impact. Users of the system treat owning a certificate for X as equivalent to doing X themselves. In the case where certificates never change hands, this reduces precisely to the status quo.

The primary difference is that certificates can also be bought, sold, or bartered; an altruist can acquire certificates through any combination of doing good themselves, and purchasing certificates from others.

For example, a project to develop a malaria vaccine might be financed by investors. If the project succeeds the developers can declare themselves owners of an associated certificate, and distribute it to investors in the same way they might distribute profits. These investors could then resell this certificate to a philanthropist who is interested in funding malaria prevention and who honors certificates. The philanthropist would recognize the certificate as valuable to the extent that they believed that the original project was causally responsible for the development of the vaccine, and their willingness to pay would be the same as their willingness to develop the vaccine themselves (evaluated with the benefit of hindsight).

Note that judging the value of a certificate is just as subjective as judging the value of the underlying activity, and is done separately by any philanthropist considering acquiring that certificate.

# 1. Some existing challenges

1. Evaluating philanthropic opportunities is difficult, and most are not very good. Predictions are expensive and inaccurate, and often infeasible for small donors. The problem is worst when evaluating novel interventions. Prizes can address some of these difficulties, but have their own set of problems.
2. One person might have the ability to do a project, another the desire to fund it, and a third the knowledge to evaluate it. Coordination is hard, and existing incentives misaligned, both for disseminating good information and executing good projects.
3. Thinking about crowding out and causal responsibility is hard: if I don’t do something, will someone else? Does it matter which of Oxfam’s activities I fund? How is causal responsibility divided between donors and employees? Between the philanthropist who buys malaria nets and the government which distributes them?
4. Prices are an elegant and flexible system for communication and coordination, which are often unavailable for altruists.
5. Reasoning about leverage, and interacting with funders with different priorities, is tough. It’s easy to end up neglecting a large possible upside or engaged in zero-sum conflict.

# 2. Certificates of impact

Whenever anyone does something good in the world, they can “mint” an associated certificate of impact and declare themselves to be the owners. This can be as simple as making a public statement, analogous to acknowledging a funder. At the bottom of this post I could write “This post backs certificate [RationalAltruist-22], which is now owned by Paul Christiano;” I could do the same in a press release describing a medical intervention, an academic paper reporting the results of an experiment, or a piece of open source software. Independently, I might post an offer to sell these certificates, or a philanthropist might contact me and express interest in purchasing them.

By deciding which certificates they are willing to pay for, altruists using the system define the rules of the game. The protocol suggests considering a certificate valuable only if
1. It was issued by the group or individual that performed the associated activity.
2. It is the unique certificate associated with that activity.
Users should be willing to pay the same amount for a valid certificate of X that they would be willing to pay to cause X to happen (and to keep the resulting certificate). That is, I should be indifferent between spending $100 to do a good deed and paying someone else$100 to do it, provided that in either case I get the entire certificate for that good deed.

Naturally this willingness to pay is subjective, depending on both values and views—just like conventional grantmaking. Users maximize the total value of all of the certificates they hold, using whatever combination they prefer of doing good deeds themselves or acquiring others’ certificates.

Certificates can be transferred just like any other IOU or title, and have the same practical issues with bookkeeping and double-spending. We can resolve these however we like (word of mouth, a bulletin board, a trusted central party, the bitcoin blockchain…). Establishing properties [1] and [2] probably involves trusting the issuer—just like conventional grantmaking.

Certificates can be subdivided arbitrarily. When a group accomplishes a project together, they must decide how to divide the resulting certificates in the same way that a profitable enterprise would decide how to divide the profits.

Owning a certificate for X would probably not carry the same prestige as doing X yourself. Funders using the system purchase certificates as a way to do good, not necessarily as a way to earn credit (though helping them get credit may be useful for getting them on board).

For now, I'm most interested in the question: would philanthropic activity in an area be improved, if many funders used this system or a similar incentive scheme?

# 3. Commentary

## Some simple examples

No transfers. In the simplest possible example, certificates never change hands. In this case, the protocol reduces to “Do the activities that you think have the largest positive impact on the world,” i.e. the status quo.

Grants. A grantmaker might pay a charitable organization to perform some charitable work, in return for the resulting certificates. This also reduces to the status quo, at least for the grantmaker. A grantmaker might also leave some of the certificates to the charities, in the same way that a startup retains equity as an incentive.

Prizes. An unfunded do-gooder might keep the resulting certificates to themselves. Later, a philanthropist who appreciates the value of their work could buy the certificate off of them. The end result is very similar to a prize or bounty. As with a prize or bounty, that philanthropist could state their intentions in advance, choosing their own balance between flexibility and predictability.

## So what?

Reproducing the status quo isn’t so exciting. Do certificates improve the situation, or even change it? I think so, in ways that should be interesting to particularly effectiveness-minded funders. For example:

1. Allocating certificates requires explicit and transparent allocation of causal responsibility, both within teams and between teams and donors. In addition to the obvious cultural effects (which I would welcome despite the costs), this aligns individual incentives with altruistic goals, reducing incentives to mislead donors, volunteers, and employees.
2. Exchanging certificates for money leads to a more consistent conversion between good done and compensation, especially if funders use a mix of prizes and grants. It can prevent good deeds from falling through the cracks, ameliorate some winner-take-all PR dynamics, and eliminate some zero-sum conflict. It also makes it easier to move between different funding modes.
3. Purchasing certificates helps funders with different values coordinate; if I see a good deal I have an incentive to take it, without worrying about whether it might be an even better deal for someone else.
4. The ability to resell certificates makes a purchase less of a commitment of philanthropic capital, and less of a strategic decision; instead it represents a direct vote of confidence in the work being funded.

There are also risks inherent in bringing altruistic incentives closer to profit incentives (substituting extrinsic for intrinsic motivations, introducing new scope for zero-sum conflict...). How you feel about the tradeoff depends on how you feel about the relative merits of the two approaches, and may vary across domains.

## Some more examples

In addition to these simple examples, certificates of impact can facilitate more exotic interactions.

Financing. If I’m optimistic about your project I might give you a loan which I expect you to pay back by selling a certificate. Or I could buy the certificates off you, as if I were a grantmaker, with the intention of reselling them.

Research universities. A research group can employ researchers in exchange for ownership of some of the certificates of impact they produce. These certificates can then be sold to funding agencies or philanthropists. This shields those funders from having to make predictions about research output, which they are often not equipped to do, and provides good incentives to both researchers and research groups. (This is a special case of financing and causal attribution, but it’s an application close to my heart.)

Interpolating between prizes and grants. By implementing both prizes and grants as trades, it is easier to interpolate between the two, providing some funding to get a project going in exchange for part of its output (presumably at an expected discount) and then purchasing more of its output after the fact.

Moral trade. Many cases of moral trade can be implemented by turning good deeds into certificates and bartering or trading in a marketplace. For others, such as abstaining from eating meat, this would be problematic (though it’s not clear that the use of certificates s to blame).

Targeted donations. If I want to fund only part of an organization’s activities, I can purchase only those certificates of impact which I find valuable.

Research on effectiveness. If I think a certificate is too cheap, I can do research to evaluate its effectiveness; depending on the result I can buy the certificate, publish my research, and resell the certificate.

Trades across time. If my discount rate is lower than interest rates, I can sell certificates of impact today, invest the proceeds, and purchase certificates next year. (The price of each fixed certificate should rise at roughly market rates; but in addition to that, a certificate for a life saved in year 1 may have a different value than a certificate for a life saved in year 2, reflecting the discount rates of philanthropists.)

Speculation. If I think at a change will be considered good in retrospect, I can purchase appropriate certificates now and aim to resell them later at a profit.

Multiple bottom lines. If a project has several objectives, it can use certificates to monetize all of them and then make local profit-maximizing decisions. This may lead to more sane decision-making, and much more transparency, than the status quo.

(I’m sparing you a much longer list.)

## Some theory

Suppose that everyone who valued X were using the certificate protocol. (For concreteness, suppose it’s everyone interested in cosmology research.)

Then at equilibrium, the price of certificates of impact on X is equal to the marginal cost of achieving an impact on X. Any deviation is an arbitrage opportunity: if you can do X more cheaply, then you can sell the resulting certificates for a profit; if you are doing X more expensively, then you could save money by buying certificates instead.

Moreover, the status quo corresponds to one way of producing certificates, with total value equal to the total good being done. The actual outcome should be a Pareto improvement, and in particular should increase the total value of available certificates. As a result, it also increases the total amount of good being done.

I wouldn't lean on this argument alone. But I do think it suggests that things might tend to work themselves out, at least if the system were widely adopted. For me, considering concrete cases bolsters that intuition.

The infra-marginal units of X, those that were cheaper to produce than the marginal unit, pose a theoretical problem. These units of X get produced and purchased (good news!), but the resulting certificates are most likely to be sold for the marginal price of X (bad news!). That means there is a transfer of wealth, from the people who care about X (and who use the certificates system) to those who have infra-marginal opportunities to do X.

This problem is worst for the early adopters of the certificate system, which is particularly unfortunate. And it’s even worse when the opportunities to do X are so cheap that they were going to get done anyway. For example, suppose some high energy physicists would have to go out of their way to avoid doing some cosmology. Under the certificates system they would get paid for this research by cosmology funders who purchase the resulting certificates. But the cosmology funders might not be so happy about this, since the counterfactual impact of this funding is zilch.

Whether this is a feature or bug depends on how many really cheap opportunities to do X were failing to get done. Maybe the high energy physicists wouldn’t even bother publishing their cosmology in a format that cosmologists would understand, because the high energy community wouldn’t give them any respect for it. In this case there might be huge social benefits from paying them to do so. My own guess is that we leave a lot of low hanging fruit hanging, and that picking it is more important than worrying about the transfers.

# -1. Note

I have omitted any discussion of how certificates might be implemented, especially discussion of how you might get from here to there. This is a tough problem, but I think that a single advocate could make meaningful headway if it seemed worthwhile. I’m interested in the prior question, is it a “there” worth thinking about?
New Comment

You might be interested in:

http://en.wikipedia.org/wiki/Health_Impact_Fund

http://en.wikipedia.org/wiki/Social_impact_bond

Which are practical prize type solutions along similar lines.

The HIF in particular is very closely related; that's roughly what I imagine an early implementation looking like.

Thanks for the pointers.

This idea also reminds me a little bit of performance based incentives in aid, such as Cash On Delivery programs. Performance based incentives are relatively new, though, so I haven't been able to find many impact evaluations, although initial reports are promising for health interventions (1, 2). There was even talk a few years ago of creating a stock market for charities, but I don't think that has gone anywhere. Robert Shiller also proposed something called a Participation Nonprofit at one point where people would buy shares in a nonprofit then spend the returns on charities. All of those have elements of what you're talking about, but don't put it all together.

This whole structure of certificates of impact seems to derive its main benefit from allowing market mechanisms to work in the altruistic domain. When I've thought about trying to access these market mechanisms, the main problem has appeared to be anchoring the value so that expectations work properly. For instance the value of stock in the stock market is anchored by the profits that the firms will eventually make.

You don't spend much time addressing this problem. I'm not sure if you mean to include it in the note at the end of things you are setting aside, but at least to my mind it seems relevant to the question of whether such a system could work properly if we arrived there.

My previous attempts to solve this problem had involved anchoring by (occasional, stochastic) explicit external evaluation, but this turns up other difficulties. If I understand it correctly, you're thinking instead of anchoring to how much people really value things. The issue with this is that values can fluctuate over time, so I don't know that it's really well-founded. If the amount its value today comes apart quite a bit from how its expected to be valued tomorrow (and this will continue), I'm not sure how it would stabilise.

What I'm particularly worried is how people would value old certificates. It seems plausible that people would have little interest in certificates from 80 years ago, and expect future interest to continue to drop off. Do you envisage some mechanism to counteract this? Old certificates would by their nature be irreplacable, so we might hope that possessing them achieved some cachet like possessing old artwork has in the world today. But I don't feel confident that this would work.

A philanthropist (or funding agency) gives certificates value by their efforts to acquire certificates.

I.e. rather than funding a bunch of research that it thinks looks promising, the NSF tries to purchase research output. People may buy certificates (or hire researchers in exchange for a fraction of their certificates) because they expect the NSF to buy them later.

The expectation is that the NSF won't subsequently resell all of these certificates. Doing so would be an explicit preference reversal (unless the value of the certificates grew faster than the NSF's rate of return, in which case other donors have decided that the NSF funded good things, and the NSF might decide to sell them).

ETA: this subsumes the proposal of occasional, stochastic valuations. A funder interested in tying the value of certificates to some explicit benchmark X can periodically buy certificates at a value determined by the benchmark X.

Yes, I see how you can get short term value from this. But how do you get a long-term stable state? How do you envision funding agencies or philanthropists making decisions about how to value different certificates? (Particular interest in this question for old certificates, because I think it makes many of the problems more salient.)

Summary: the value of certificates is generally not fixed but will change over time. But this seems like a feature, not a bug. And If everyone stopped using the certificates system, the funders who are left with the certificates should be happy with that outcome as well, for the same reason they are happy making a grant which they can't later unwind.

Suppose in 2000 a funder buys some certificates that (they think) represent lives saved in 2000. They are happy with that investment, and just to keep the certificates indefinitely; it is not clear that those certificates will ever change hands again after 2005. If a funder had the opportunity to "undo" their earlier funding opportunities and get back the money, how often would they take it?

When valuing certificates at different times, the idea is for a funder to consider how many dollars they would pay to do a good deed in 2000, vs. a good deed in 2005. This is a question that funders already face, when choosing whether to invest or do a good deed now. Allowing them to answer the question with the benefit of hindsight (and allowing speculators to bet on what their answers will be) seems like a bonus.

It seems like the main concern is if they don't think of selling certificates as unwinding their original good deed, i.e. if they aren't using the certificates system. If they are using the system, then the overall transaction is just a straight-up loss for them. If they aren't using the system, then it's not really our business how they interact with it (adding people who sometimes buy certificates but who don't value them can't do any harm, it just drives up the value of certificates and benefits the users of the system).

If a funder did decide to unload their life-saved-in-2000 certificate, the idea would be for someone else to step up to buy them for the reduced price. If people interested in saving lives in 2000 are actually using the certificates system, then the price can't fall far before someone will become very interested in buying it.

In fact it's quite likely that the value of certificates for realistic interventions will vary hugely over time as more information is revealed about how good they were. This happens on top of the overall discount rate between good-in-2000 and good-in-2005, and seems like a further bonus.

I agree with your general point about changing value of certificates as we get more information being a feature (this is the kind of thing I meant by tapping into market mechanisms).

Suppose in 2000 a funder buys some certificates that (they think) represent lives saved in 2000. They are happy with that investment, and just to keep the certificates indefinitely; it is not clear that those certificates will ever change hands again after 2005.

OK, I see you're envisaging a less liquid market than I was. Though there are certainly some situations where I'd expect people to sell long after the fact. For instance if someone dies 40 years later and the certificates pass to their next-of-kin who doesn't value the work, they might well seek to sell them.

In order to understand whether this is a state which would be desirable, I'm trying to picture what the world would look like today if we'd been using these since, say, 1800, and there were lots of old certificates lying around. I haven't been able to provide myself with a stable picture of this, which makes me somewhat sceptical.

If a funder had the opportunity to "undo" their earlier funding opportunities and get back the money, how often would they take it?

I think this would happen a lot as people gained information. Then funding gives you an option value of cashing out, whereas not funding wouldn't necessarily give you the chance of retroactively buying the thing (people would also fund more high-variance things). Of course that doesn't mean that people would want to sell the certificates, because information that made them want their money back would also tend to drop the going price for the certificates.

My point is that the existence of future funders who don't care much about "Lives saved in 2000" can never drive down the value of such a certificate, it can merely drive up the value of certificates that the future funders care about.

If the market becomes illuiqid (once the funders who care about lives saved in 2000 are gone), this shouldn't be troubling to the funders left with the certificates, since that just means they are assuming responsibility for the things they funded (as in the status quo).

That said, I don't see why there is any problem with valuating the old certificates, aside from skepticism about whether anyone in 2000 cares enough about the good deeds done in 1800 and would actually honor certificates.

I wonder if it would make sense to sell certificates of Impact as non-fungible tokens (NFTs), given that NFTs are emerging as a lucrative way of publicly representing the "ownership" of non-physical assets like digital artwork.

Shouldn’t impact be fungible at some level though?

Ohh, I should've made this clearer.

The NFT would be used to represent responsibility for (custodianship of) a particular impactful action. Just as with impact certificates as previously proposed, a person who, for example, runs EA Harvard for 2018, could put responsibility for this impact onto the marketplace. Buyers, when pricing this asset, can then evaluate how well EA Harvard did at creating things (that may be fungible) like number of EAs produced, or net effect on wellbeing, and pay accordingly.

I think it's useful to sell responsibility for the impact of a particular action  (which is non-fungible), rather than a some responsibility for some (fungible) quantum N of impact, so that the job of judging the impactfulness of the action can be left to the markets.

Ah, that makes sense :-)

I'm guessing that for these to work, the ownership of certificates should end up reflecting who actually had what impact. I can think of two cases where that might not be so.

Regret swapping:

• Person A donates $100 to charity X. Person B donates$100 to charity Y.
• Five years later they both change their minds about which charity was better. They swap certificates.

So person A ends up owning a certificate for Y, and person B ends up owning a certificate for X, even though neither of them can really be said to have "caused" that particular impact.

Mistrust in certificate system

• Foundation F buys impact certificates. It believes that by spending $1 on certificates, it is causing an equivalent amount of good as if it had donated$2 to charity X.
• Person A is skeptical of the impact certificate system. She believes that foundation F is only accomplishing $0.50 worth of good with every$1 it spends on certificates (she believes the projects themselves are high value, but that if foundation F didn't exist then the work would have got done anyway).
• Person A has a $100 budget to spend on charity. • Person A borrows$50 from her savings account and donates $150 to charity X. She sells the entire certificate to foundation F for$50 and deposits this back in her savings account.

Why would person A do this? She doesn't care about certificates, just about maximizing positive impact. As far as she is concerned, she has caused foundation F to give $50 to charity X, where otherwise that money would only have accomplished half as much good. Why would foundation F do this? It believes in certificates, so as far as F is concerned, it has spent$50 to cause a $150 donation to charity X, where the other certificates it could have bought would only be equivalent to a$100 donation.

There might be some interesting tricks here. Like suppose you saved someone's life, and wrote a certificate for yourself, but they turned out to be an ax muderer. In such a situation, you might have to pay other people to take the certificate from you. Alternatively, you would might hide the certificate. But by hiding the certificate, you're avoiding culpability for your harmful actions to some extent. Of course, people are able to avoid culpability for altruistic actions that turn out to be harmful in the status quo, I'm just observing that for this sort of reason, an economy based on Impact Certificates would not symmetrically deliver the impacts of people's actions to them.

Yes, this system offers no protection against people doing bad things. (Even if they pay people to take certificates off of their hands, the price would be far too low.) That responsibility falls to the usual mechanisms, e.g. legal protection.

A problem is that it would incentivise people to do risky altruistic activities like enacting big political changes or developing risky tech.

[-][anonymous]6y 0

Even if some people think that a particular kind of certificate is bad (has negative social value), as long their opinion isn't in the majority, I think a liquid market for certificates would be able to handle this efficiently. If most people think that outcome A is good but I think it's bad, I can short-sell A-certificates, and this works as long as the price is positive (i.e. I'm in the minority).

If directly thwarting A is cheaper than short-selling, I might be tempted to do that, but it would be inefficient (my actions cancel out others' actions, and the net effect is to waste money for nothing). Fortunately, it seems like the certificate system still provides an efficient way to do "moral trade" in this case! Other people who agree with me can set up a market for anti-A-certificates - backed up by my ability to directly prevent A. Essentially, the others would pay me to carry out the anti-A intervention. The pro-A people can then shut this down by shorting the anti-A-certificates until I'm no longer able to fund my anti-A activities.

My guess: After a while, each side would be paying the other money not to carry out their intervention. Some pro-A interventions would be funded, but less than if the anti-A people couldn't short-sell. No anti-A interventions would be funded, so no obvious inefficiencies happen.

Does that sound correct? I'm no expert, and I'm not sure whether that's actually the stable equilibrium.

I'm still a little confused as to whether these certificates are intended to confer social status. If not, why should I value universes in which I own certificates more highly than universes in which I don't?

Should I just look at the big picture and decide it's beneficial to self-modify so as to give ownership of certificates intrinsic value in my utility function?

One possible use for certificates other than bragging rights is A/B testing - pick two EAs with similar skills and resources but different strategies, and see who ends up with more certificates.

You can think of it as a way of doing accounting for causal responsibility if you want. But yes, the argument is aiming for "if we did this, the outcome would be good," and I'm leaving it up to your decision theory to justify doing things that lead to good outcomes.

I worry about people's preferences changing over time, either as they get older or as a result of running into financial difficulties. I can imagine buying a bunch of certificates in my idealistic youth and then selling them off again in my cynical old age. At any point in time I'd feel like I was doing the right thing, and whatever philanthropist bought the certificates off me would think they were restrospectively funding the original project when actually they were just putting money into my pocket.

This is sort of the opposite problem of what (I think) Owen_Cotton-Barret was describing with old certificates becoming valueless.

Thinking about this a bit more... If I don't trust my future self with these certificates, I can always send them to some other entity which will look after them in a way consistent with present-self's wishes.

This could be an account in a different name, corresponding to an entity which I believed caused my behavior, and which I believe will responsibly hoard the certificates (e.g. GiveWell).

Alternatively it could be an ethereum-style contract which allows me to either hold on to the certificate or give it away (given enough other signatures verifying that I'm giving it to a reputable party and that I'm not benefitting financially from giving it away).

This sort of lock-in could also be a mechanical part of how certificates work, e.g. they allow themselves to be traded freely for a month and after that it gets more and more difficult.

The situation where certificates are bought and sold at near the original donation price is somewhat peculiar. Essentially, rather than giving away your assets to charity you'd be exchanging real money for some riskier and weirder asset, but which is nonetheless still worth money. Giving away certificates then feels like a sort of "second order altruism" which then maybe deserves a certificate of its own...

I like this idea. Thinking about the following case was helpful for me:

Suppose for the sake of argument

• I have two career options, Charity Worker or Search Engine Optimizer.
• CW generates 5 utilons in direct impact, and 0 utilons via earning-to-give
• SEO generates 0 utilons in direct impact, and 3 utilons via earning-to-give
• There are plenty of people who don't identify as EAs and/or don't take Paul_Christiano's certificate idea seriously, but who want to work as CWs.

From first glance it looks like the system would fail here - if I'm trying to maximize my certificates, and most other people in the market don't care, then I'd choose CW and crowd-out somebody else.

But I think what would actually happen is that I'd choose the SEO option, earn a bunch of money and then say "hey, charity worker, over here on the internet there's an apparently meaningless collection of numbers with your name at the top. I'll give you $5 if you log in and change it to my name". I'd end up with certificates valued at more utilons than if I'd just taken the CW option. Even if a typical person didn't view these certificates as valuable or meaningful initially, they'd start to once they heard about this mysterious community who was willing to pay money for them. In practice this might look different depending on the scale of implementation (how fine grained are certificates; who are the certificate-issuers). One extreme is: • You are issued with a certificate whenever you help someone; • There is a liquid market in the certificates; • Helping someone is seen (by the market) as good to the degree to which it benefits them; • Helping two individuals by the same amount is seen (by the market) as equally good. Then the certificates essentially become a currency system, which has something like a guaranteed basic income built into it (the amount that you can be helped in a given year). This extreme probably isn't exactly what you have in mind (for instance, I'm not sure how it would interact with helping future people). But I don't have a good sense of how far in this direction you're thinking. Presumably there is a market for certificates amongst those concerned with e.g. the global poor, and it might function in this way. There is no provision in this system for allowing the beneficiaries to determine the value of these certificates. As with contemporary philanthropy, this responsibility falls to the philanthropists, who may or may not execute it responsibly. (This judgment would be reflected in the relative prices of "Helped Alice by doing X" and "Helped Alice by giving her$1," which may have some benefits in terms of transparency.)

Cash transfers are a more direct way to capture these benefits. (After cash transfers are in place, providing goods to the poor can then be a profit-oriented enterprise.) The key question is just whether you think philanthropists or beneficiaries are better at comparing benefits.

Full disclosure: I fear I do not completely understand your idea. Having said that, I hope my comment is at list a little useful to you.

Think about the following cases: (1) I donate to an organization that distributes bednets in Africa and receive a certificate. I then trade that certificate for a new pair of shoes. My money, which normally can only be used for one of these purposes, is now used for both. (2) I work for a non-profit and receive a salary. I also receive certificates. So I am being paid double?

The second case is easily solved, just give the employee either or. But then, what is the benefit of a certificate over a dollar bill? The first case presents a bigger problem I think, since essentially something is created from nothing. Notice that donations are not investments the donor can expect a return on (even if they are an investment in others).

If you buy and then sell a certificate, you aren't funding the charity, the ultimate holder of the certificate is. They will only buy the certificate if they are interested in funding the charity.

You could pretend you are funding the charity, but that wouldn't be true---the person you sold the certificate to would otherwise have bought it from someone else, perhaps directly from the charity. So your net effect on the charity's funding is 0. I could just as well give some money to my friend and pretend I was funding an effective charity.

(I'm setting aside the tax treatment for now.)

You would pay an employee with certificates for the same reason a company might pay an emplyee in equity. If there is no secondary market, this can be better for the company for liquidity reasons, and can introduce a component of performance pay. But even if there is a secondary market (e.g. for Google stock), it can still be a financially attractive way for a company to pay a large part of its salary, because it passes some of the risk on to the employee without having to constantly adjust dollar-denominated salaries. (There are also default effects, where paying employees in certificates would likely lead to them holding some certificates.)