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Since the time of Peter Kropotkin, it's been observed and theorized that cooperation and mutual aid are more common in austere environments. A classic biological example would be slime mold spore-making (Starssman & Queller, 2011), and anecdotal example would be people coming together to face a natural disaster. I am interested in more systematic studies of this in modern human society under more extended time-frames than reactions to disaster.

In monkeys, apes, and primitive human societies, a typical measure of cooperation and mutual aid is food sharing (Jaeggi & Gurven, 2013). I am interested in seeing studies like this that use naturalistic measures like this, instead of artificial games like dictator or ultimatum (even though these do provide interesting economic and anthropological results at times; Henrich et al., 2001).

One of the few truly austere environments remaining in Western society is the plight of the homeless. For example, the U.S. Interagency Council on Homelessness (1999) has found that 28% of homeless people nationwide sometimes or often do not get enough to eat (compared with 12% for the poor), 20% eat one meal a day or less, and 40% reported that they went one or more days in the last 30 days without anything to eat (compared to 3% for the poor).

Yet, consistent with the Kropotkin's views, anecdotal evidence (i.e. what I hear from friends that have been run aways, and from the occasional homeless that I have a chance to talk to) suggests that food sharing is common among the homeless. As a highlight, here is an anecdote I encountered recently of reddit (empasis added by me):

This is why I, as a homeless person, gets offered more food from other homeless people than from wealthier people I come in contact with. This holds even though there is no pity parties among the homeless, and many food sharers will stab your back in a heartbeat if they perceive longer term gains. Or, in some cases, when more primal needs are at stake.

This brings me to my questions:

  • How common is food sharing among the homeless?
  • Is it primarily driven by empathy/egalitarianism, reciprocity, tolerated theft, or other mechanisms?
  • How does it compare to rates of food sharing in modern hunter-gatherer societies?

I am more interested in anthropological studies done in western populations and developed countries, especially big urban centers, but comparisons to homeless populations in developing countries is of interest as well. I also prefer academic studies instead of governmental/activist ones, since the latter tend to have a policy bias; but I'll take what I can get!


Jaeggi, A. V., & Gurven, M. (2013). Reciprocity explains food sharing in humans and other primates independent of kin selection and tolerated scrounging: a phylogenetic meta-analysis. Proceedings of the Royal Society B: Biological Sciences, 280(1768).

Henrich, J., Boyd, R., Bowles, S., Camerer, C., Fehr, E., Gintis, H., & McElreath, R. (2001). In Search of Homo Economicus: Behavioral Experiments in 15 Small-Scale Societies. American Economic Review, 91 (2), 73-78

Strassmann, J., & Queller, D. (2011). Evolution of cooperation and control of cheating in a social microbe. Proceedings of the National Academy of Sciences, 108(2).

U.S. Interagency Council on Homelessness (1999). Homelessness: Programs and the People They Serve – Findings of the National Survey of Homeless Assistance Providers and Clients.

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I would say this can be generalised to question "How does 'we are on the same boat' feeling work?". But also most homeless people are not particular motivated by possession and do not make big plans for future (as keeping food you don't need at the moment). –  Tomáš Zato Nov 28 '14 at 21:03
Thanks @TomášZato, if I wanted a more general question then I would have asked that more general question. You are, of course, welcome to ask the more general question as your own. I am familiar with the answer to this question in various other settings, but also know that such behaviors are very culture specific, and so I want an answer for this specific (although still very heterogeneous) group if possible. –  Artem Kaznatcheev Nov 29 '14 at 3:03
No need to feel I was doubting your question. I was just sharing thoughts on the topic... Being touchy is not a good thing on SE. –  Tomáš Zato Nov 29 '14 at 11:34

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