When random people give money to random other people (2017)

114 munificent 78 6/13/2025, 4:49:46 PM quomodocumque.wordpress.com ↗

Comments (78)

munificent · 1d ago
Noelia- · 19h ago
The first time I saw a model like this, I assumed that randomness would eventually balance things out. But that is not what happened. The rules were completely fair, yet the system still ended up producing significant inequality.

That stuck with me. Sometimes, all it takes is time and a bit of randomness for imbalance to emerge on its own. Inequality does not always come from someone doing something wrong. It can simply be the long-term result of randomness playing out. So the real question is, once we understand that, what do we do with it?

kqr · 16h ago
I also assumed randomness would balance things out, but "balance things out" means maximum entropy distribution.

With 100 people, there are only 100 configurations where one person has all of the money. But there is also only one single configuration where everyone has the same amount of money. There are a small number of configurations where everyone has almost the same amount of money.

The vast majority of the configuration space consists of configurations that on a macro level fall under the umbrella category "unequal". This is not because they are more likely states, but just because there are so many of the states we would label "unequal".

xelxebar · 15h ago
Ooo. Very cool. You just set off a storm of interesting connections for me. Assuming some ergodic process for distributing wealth then the asymptotic expectation for wealth inequality reduces to looking at random integer partitions.

Blah blah, jargon. Mostly thinking out loud here.

Basically, you're making the astute observation that the majority of configurations fill all wealth brackets... I think? The maxentropy distribution involves maximizing over products of combinations, and I'm just gut feeling at the moment.

How does this jibe with the supposedly empirical observation that wealth tends to follow a Pareto distribution?

Very cool. Thanks for kicking off the this conceptual avalanche!

kqr · 15h ago
The Pareto distribution (and indeed other heavy-tailed distributions) come out of self-reinforcing processes, where each additional amount of something increases the probability of even more of that thing. (This is what it means for a distribution tail to be subexponential.)

In our capitalist system, wealth begets more wealth, thus heavy tails.

bravesoul2 · 18h ago
But I think the catch is that while the model preserves inequality it doesn't guarantee to preserve wealth for any individual player.

Real life has feedback loops too that help preserve and grow the wealth of the rich so it is worse than the sim. It also has feedback loops the other way like tax. This makes tax very important!

specialist · 7h ago
Exactly.

For my part, I keep repeating (reposting) this refrain:

"Inequity is just math, not a moral statement. It's inevitable without some kind of proactive redistribution."

(Any feedback on my phrasing? I always appreciate better word smithing.)

It takes a long time for these kinds or counterintuitive notions to percolate thru society. But eventually they stick.

FWIW, Scott Galloway is really good at honing and refining his talking points over time.

NooneAtAll3 · 18h ago
I don't want to comment of philosophy part, but isn't math part flawed?

The problem states that everyone shares dollar on the clock tick - that means the node of the game graph has out-degree of smth like 99^100, not 100? (or maybe ~comb(199,100) with bizarre distribution if you dislike multi-edges)

And the whole idea of "undirected graphs have easy stationary distribution, so our almost-stationary one has almost-that" isn't grounded in anything but a hunch... (and having >30% of "bad" nodes doesn't seem all that much "almost" to me)

dreghgh · 14h ago
Yes you are completely right. All the analysis is done for a game where one randomly chosen person with money gives one other randomly chosen person one dollar at each time step.

Some of the conclusions might be similar since random processes often have a certain regularity where exact details don't matter.

But basically every formula in the article is completely incorrect.

gnabgib · 1d ago
Discussion (555 points, 2017, 241 comments) https://news.ycombinator.com/item?id=14729400
probably_wrong · 1d ago
I remember that discussion because of the comment [1] pointing out that the rich people don't stay rich forever - the distribution may be skewed but that doesn't mean that the richer get richer.

[1] https://news.ycombinator.com/item?id=14729930

cantaloupe · 1d ago
Only if no interest is accrued on assets. When interest is introduced, there is no longer shuffling.
autobodie · 1d ago
Nonsense. There is a big difference between the implications of the following claims:

1. The specific people that are currently rich will become richer.

2. The people that are rich at any given instant in the future will be richer than the people that are rich at the current instant.

"The rich are getting richer" almost always means #2, but it depends on the context. #1 may be more interesting to individuals competing for wealth, or for an assessment of individual mobility, but #2 is much more relevant when describing the aggregate conditions of a society. For example, the Gini Coefficient depends on #2, not #1.

I don't think it's a stretch to say it's dishonest to presume the first meaning.

majormajor · 1d ago
> Nonsense. There is a big difference between the implications of the following claims:

> 1. The specific people that are currently rich will become richer.

> 2. The people that are rich at any given instant in the future will be richer than the people that are rich at the current instant.

> "The rich are getting richer" almost always means #2, but it depends on the context. #1 may be more interesting to individuals competing for wealth, or for an assessment of individual mobility, but #2 is much more relevant when describing the aggregate conditions of a society. For example, the Gini Coefficient depends on #2, not #1.

> I don't think it's a stretch to say it's dishonest to presume the first meaning.

When I see people say "the rich are getting richer" - say, about tax cuts for high-income earners or businesses - it's always been definition 1. In the case of tax cuts, the action is expected to make the specific current rich people get richer. Or, when used as a more general idiom about the way of the world, that having money gives you a huge advantage in terms of making more money that means the gap is likely to widen over time.

Some other places interpreting the idiom that way:

https://www.phrases.org.uk/meanings/the-rich-get-richer-and-... "the inevitability of the literal truth that, the richer you are the more relatively rich you become and, for the poor, vice-versa"

https://en.wikipedia.org/wiki/The_rich_get_richer_and_the_po... "Shelley remarked that the promoters of utility had exemplified the saying, "To him that hath, more shall be given; and from him that hath not, the little that he hath shall be taken away. The rich have become richer, and the poor have become poorer; and the vessel of the State is driven between the Scylla and Charybdis of anarchy and despotism."[1] It describes a positive feedback loop (a corresponding negative feedback loop would be e.g. progressive tax)."

So it's hardly dishonest to assume the first meaning. Where are examples in common discourse of it frequently meaning the latter?

staplung · 20h ago
This is explored in more depth in one of Peter Norvig's pytude notebooks:

https://github.com/norvig/pytudes/blob/main/ipynb/Economics....

pfortuny · 1d ago
Essentially similar to “after N throws of a coin, what will the difference be between heads and tails?”. It will most likely be away from 0, and probably large.
majormajor · 1d ago
If you keep flipping a coin you get heads or tails every time. There's no streak-breaking limit where you stop counting consecutive heads after some point. But here a streak can run into a loss-limiting wall "for this turn, you have $0, so you can't give any more away." That boundary - unless you allow infinite negative balances - breaks the first-glance intuition. As people hit 0, the amount of dollars that are redistributed on the next turn goes down. So the richest will still be losing their dollar a turn, but are less likely to gain a dollar. Which will have the most significant effect on people nearly-broke, since they will still lose, but gain less frequently.
pfortuny · 11h ago
OK, interesting take which I had not realized: the problem is also different because there is a limited amount of cash, I now realize.

However, the idea that “the mean distribution (the uniform, in this case)” needs to be near the N-th step one is what is statistically wrong, that is why I turned to the coin example.

But yes, thanks for pointing out the differences!

thaumasiotes · 1d ago
Isn't the expectation sqrt(N)?

(The expectation of |H - T|, that is; the expectation of (H - T) is 0.)

pfortuny · 1d ago
I think it is so (I seem to recall it and the example from Feller's book).
madcaptenor · 1d ago
It's definitely on the order of sqrt(N). But it's a bit smaller than sqrt(N) typically:

(1) H is asymptotically normally distributed with mean N/2 and variance N/4 (central limit theorem)

(2) So H - T = H - (N - H) = 2H - N is ~normally distributed with mean 0 and variance N, or st.dev. sigma = sqrt(N)

(3) So |H-T| is "half-normal" (https://en.wikipedia.org/wiki/Half-normal_distribution). This has mean sigma * sqrt(2/pi) or approximately 0.8 sqrt(N).

This can be checked with a quick simulation. For example in R I run 1000 simulations with N = 10000 with the one-liner

    mean(abs(2*rbinom(1000, 10000, 0.5)-10000))
which returns 79.944.

The mean square of H-T will be approximately N, though (basically we can ignore the absolute value when computing the variance).

In fact, it's exactly N. H is Binomial(N, 1/2) which has variance N/4. H - T = 2H - N has variance N/4 * 2^2 = N, and mean 0, so its mean square is N.

k__ · 1d ago
"inequality of wealth rapidly appears and then persists (though each individual person bobs up and down from rich to poor."

Does still sound fair to me.

cantaloupe · 1d ago
This is only when no other effects/processes are accounted for. If every participant keeps their current funds in an account with the same interest rate, then the distribution permanently skews so that there is no longer bobbing. The rich stay rich. See this more detailed simulation linked in another comment: https://joshworth.com/jpw/does-this-simulation-explain-why-l...
munificent · 1d ago
The paper this is based on [1] does a good job of spelling out:

The instantaneous distribution of money among the agents of a system should not be confused with the distribution of wealth. The latter also includes material wealth, which is not conserved, and thus may have a different (e.g. power-law) distribution.

The simulation might be a good model of how money distribution works, but it doesn't reflect how wealth distribution works. The simulation only works because money can neither be created nor distroyed (in the simulation, at least). Wealth can be so we shouldn't expect the simulation to predict its behavior.

[1]: https://physics.umd.edu/~yakovenk/papers/EPJB-17-723-2000.pd...

dgan · 1d ago
okey but the burning question now is: how much more fair it becomes when the richer participants give specifically to poorest participants, instead of random one?
munificent · 1d ago
The system is fair. While the distribution is non-uniform, over a long enough time span, all participants will appear at every place in the distribution.
cantaloupe · 1d ago
This more detailed simulation shows the impact of UBI, interest, etc. Unsurprisingly it is much more balanced with UBI and even more extremely skewed with interest accruing. https://joshworth.com/jpw/does-this-simulation-explain-why-l...
dfxm12 · 1d ago
Everyone starts with the same money in this thought experiment. How do you define richer and poorer with that in mind?
msgodel · 1d ago
What incentive is there to work to become rich if you have to give it away anyway?
dakr · 1d ago
This argument reminds me of theists asking, "without a god, what is there to keep you from being amoral and running around killing people?"

Humans are capable of and do, in fact, act on more than just one or two simplistic external levers. We have agency, understanding, and drive to have empathy and to create.

msgodel · 1d ago
Right but the natural state of humanity without real social norms and meta norms is to just form small, violent, relatively unproductive tribes. Civilization doesn't scale without rules.
kqr · 1d ago
Of whose natural humanity? Areyou naturally violent and unproductive without coercion? I'm not.
JackSlateur · 23h ago
Of course we are (maybe not you as an individual but whatever)

As some french guy said, probably: "De la contrainte nait la créativité"

msgodel · 1d ago
I build things, just not things anyone else wants. Other people absolutely do seem to have violent tendencies without coercion.

People don't naturally collaborate the way you see them in the developed world no.

kqr · 17h ago
You say people don't collaborate yet cite no source, so I can only assume you mean you wouldn't be collablrative. I can assure you I would be collaborative.

The idea that people in the wild are uncivilised savages is old racist propaganda.

foxglacier · 12h ago
You wouldn't exist because part of what makes you who you are is the society you've lived in and its social norms. If you had been born into a tribal society, you'd be tribal - or dead if you refused to cooperate with its culture.
kqr · 9h ago
Right but what says that culture would be violent and unproductive, rather than kind and productive? That's what I don't get. Runs counter to what I think is my nature and tbose around me, so I'd expect a position that has considered more evidence from your end.
jaoane · 15h ago
Is this a serious comment? It hits all the bases.
kqr · 15h ago
All my comments are serious in matter. Some are whimsical in tone. Many are wrong in fact.

I suggest erring on the side of earnesty when replying. The discussions that come out of those threads tend to be more interesting.

Nifty3929 · 1d ago
I think there is a bit stronger version of your argument: The wealth that I have is intrinsically tied to me personally: It's a business that I'm running, an idea I'm pursuing, etc. Taking it away from me destroys it.

The discrepancy comes from confusing money with wealth. You can take my $100 and then you will have $100. But if you take my business away from me, you will end up with very little. And so will everybody else that was benefitting from the business that I was running.

andriamanitra · 17h ago
This is a compelling argument but there is an upper limit of how much wealth can be intrinsically tied to a person. When we start talking about 8, 9, 10, 11, even 12 figures it's really hard to argue that the value of the wealth would diminish if it was distributed among more people. If anything I would expect people with more modest amounts of wealth to be more motivated to manage it (rather than hiring someone else to do it, at which point there is no intrinsic personal connection).
dfxm12 · 1d ago
You can become rich enough that you can afford to give away a dollar to someone every second and still be rich. For some perspective, this full amount is about 33% of annual income of $100mm. The richest people make well more than this.

Consider, even without such a system, more people than you realize have enough to live on (and pass on for generations), but still work. A lot of rich people also didn't work for their wealth. People have worked their whole lives and not become rich. I'm not sure there's a connection.

Nifty3929 · 1d ago
Unfortunately, money is not stuff. Taking money from rich people and giving it to poor people doesn't create any additional stuff for those poor people to consume.
yetihehe · 9h ago
It would create more stuff by increasing market size. Those poor would be able to afford more stuff, so more stuff would be made. I'm currently in process of making something people don't need, but might like (recreating old glass who everyone remembers from their youth). I can't produce too much, because it's not competitive with cheapest glasses. If more people had more money, more people would be able to impulse buy that glass and I could make more of it. If more people had money, they would be able to do such things themselves, I'm only doing it because I'm earning a lot and banks essentially compete in who can give me the cheapest money to do interesting things. It's pretty funny actually and I have access to money much more cheaply than poor people (lower interest rate).
bongodongobob · 1d ago
Rich people generally don't make a goddamn thing.
WalterBright · 20h ago
Elon Musk
WalterBright · 20h ago
Not enough incentive is left for a sustainable society.

It turns out that selfish incentives are far more effective than any others.

myflash13 · 1d ago
What incentive is there to work to create wealth if an interest-based system is rigged towards the already-wealthy?
WalterBright · 20h ago
Creating wealth for yourself is what matters. Other people having more than you is irrelevant.
myflash13 · 14h ago
The wealthy have no incentive to invest their money in productive enterprises if it is sufficiently profitable to sit on it and earn interest. Similarly, people who would otherwise work hard at productive enterprises are discouraged by seeing how easy it is for the wealthy to simply do nothing and get richer.

And the result you have is: the modern American economy, where most efforts go into derivative financial products and investing, rather than actual productive enterprise. Day-to-day goods and services get worse and more expensive while the stock market keeps going up.

WalterBright · 2h ago
Earning mere interest is a poor rate of return, and the taxes paid on the interest make it worse than useless. Wealthy people want larger returns, and that's why they invest in companies.

> where most efforts go into derivative financial products

No evidence for "most".

> and investing

Yes, investing in productive enterprises.

Who do you think invested in Microsoft, Google, Amazon, Nvidia, Apple, etc?

scotty79 · 1d ago
What incentive is there to work if you are going to die anyway?

The incentive is that you could potentially enjoy something briefly and that's the best deal you can get.

mhuffman · 1d ago
>The incentive is that you could potentially enjoy something briefly and that's the best deal you can get.

Many people might say that is a lower incentive than to being able to leave your family better off than they were, or in your more greedy interpretation, so that their children and their children can enjoy something less briefly than you were able to.

scotty79 · 1d ago
Many more people are single and don't plan on having a family. And for those who have .. tax is always lower than 100%. You won't leave your family worse off by earning more money, regardless of the specific level of the tax.
Jimpulse · 1d ago
Initially, security. Then maybe a realization that you don't need all of your wealth to be secure.
parliament32 · 1d ago
> maybe a realization that you don't need all of your wealth to be secure

Then why wouldn't I just stop working? Why bother working at all if I'm guaranteed to be subsidized by other people?

input_sh · 1d ago
To give your life a purpose? To do something meaningful and fulfilling? To build something cool? To be able to afford additional, cooler things? To work on a common mission with likeminded people? To contribute something back to the system? To experience how things work in the background? To have a sense of ownership over your productive output?

And if you wanna express yourself creatively or just do nothing for a while, that's fine by me too! I'm sure you'd get bored after a while and want to make yourself useful again, so I don't think you should starve in the meantime.

ncruces · 1d ago
I'm sure people who, idk, have to clean up office toilets, do it because it's meaningful and fulfilling.
dreghgh · 14h ago
But most people clean their own toilets in their house.
msgodel · 11h ago
That's our point. The limit of this is no serious social collaboration. You can't have cities, you can't have industry, everyone lives in small tribal villages until they get run over by other industrious people.
msgodel · 1d ago
Oh yeah I forgot that's why I deal with insane corporate administrative bullshit to write bad software that solves problems only generated because of the scale of the internal social interactions: because it gives my life meaning.

You have hobbies and personal relationships to give your life meaning, you pay to be allowed to do that not the other way around.

darkwater · 1d ago
> You have hobbies and personal relationships to give your life meaning, you pay to be allowed to do that not the other way around.

And why don't you want to turn that around?

msgodel · 1d ago
How does it provide security if you're giving it away? Why do you need it if not working for it means you're more likely to get it for free?
the_cat_kittles · 1d ago
what incentive is there for you to post this comment if it isnt going to make you rich?
wtcactus · 11h ago
Preventing the freeloader mindset to gain more ground due to the need of some people to indulge in virtue signaling.
Spivak · 1d ago
A little bit of inequality is good as an incentive as you describe. A large amount of inequality devolves an economy into being pseudo-centrally-planned as nearly all the wealth is allocated by a small group of super wealthy individuals.

You want the incentive to get rich and then have that incentive fall off as you acquire more wealth.

msgodel · 1d ago
We already have a pretty steeply progressive income tax. Part of the problem with schemes like this is that the wealthy have the resources to dodge them so it mostly just creates problems for the productive middle class.
WalterBright · 20h ago
You can't do great things without a large amount of money. Preventing people from accumulating large amounts of money means you cannot have things like SpaceX. By limiting wealthy people, you put a cap on your own standard of living.
andriamanitra · 16h ago
Most great things that require a large amount of money are funded mostly by collectives (historically the state and church, more recently companies) rather than wealthy people. SpaceX has certainly done some cool stuff (even before it started being funded by taxpayer money through government contracts), but I think the value of all of these billionaire-funded endeavors are a rounding error in comparison to all the infrastructure, science, education and healthcare that has been collectively funded. By limiting excessively wealthy people you give money a better chance to be allocated well.
WalterBright · 2h ago
If you were correct, the Soviet Union would have dominated the world. Instead, they copied technology from the west. They did have some innovations, but not many.

Did you know that their entire aviation industry was based on technology copied from a B-29 bomber that made forced landing in Russia?

Straw · 10h ago
You might find it interesting to know that in the mid 1800s, in the UK, during a 10-year period, private investment in railways totaled 40% of GDP- an average of 4% per year. For comparison, the Apollo program was <0.5% of GDP.

The list of enormously valuable privately developed technologies goes on and on- in fact, almost all technologies. Many of these developed in the 1800s and early 1900s when there was very little government spending on research/etc. For example, oil, railways, cars, etc.

Even in cases where government research did help, often the practical realization takes a lot of money!

P.S. Companies are not necessarily collectives. It depends on the ownership structure.

thaumasiotes · 1d ago
Two thoughts:

- I don't see why it's important to this person that N people start with a total of N^2 dollars. It would seem more natural to have N people and M dollars.

- The piece says this:

> in the long run every possible state is equally likely; we are just as likely to see $9,901 in one person’s hands and everybody else with $1 as we are to see exact equidistribution again.

As stated, this is quite wrong. We're 100 times more likely to see $9,901 in one person's hands and everybody else with $1 than we are to see everybody with $100, because there are 100 different people who might have $9,901 to satisfy that description of the state. It isn't really clear whether the author understands this or not.

wordglyph · 1d ago
Introduce credit so the people with zero can still give. Then I suspect it would be more even.
deadbabe · 21h ago
The credit would have to come from someone willing to loan out money.

And if necessary, the creditor needs to be able to pass the loan on to someone else instead of $1 (since the loan itself in theory represents $1) anyway.

Each round the debtor should randomly either pay a loan or pay a random person.

The longer a debtor goes without paying loans, the more it hurts their credit score.

Credit score can be used to determine the probability of any creditors extending a loan to someone. Everyone’s credit score starts at roughly 50%.

deadbabe · 21h ago
Wouldn’t this be a cool game someone could build with crypto where all players will randomly give a unit of coin to other people every 5 minutes or so until some people get really rich?

To keep it fair the game must run for a fixed amount of time before people are allowed to withdraw their money. Then a new round begins.

dreghgh · 14h ago
You've invented gambling.
MichaelRo · 1d ago
>> When random people give money to random other people

It's called taxing the first to keep the second on welfare benefits.

rexpop · 1d ago
This is also an approximation of commercial exchange.