Evolutionary Theorists: Migration Bad For Evolution Of Cooperation
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The "selfish gene" paradigm of evolution raises a lot of fascinating conundrums about how human beings got so cooperative. If you look at chimpanzees, for example, mothers are nice to their children and members of the same group will reciprocate in picking lice off each other. But, that's about it. Their general attitude toward helping their fellow ape is: "We're chimps, not chumps." 

How could altruism evolve under the rules of natural selection? Did it? Well, taking a broad view of "altruism," dogs seem more altruistic toward humans than wolves do. Of course, that probably was the result of artificial rather than natural selection. But then how do we know that humans didn't get artificially selected for being nice, just like their dogs?

Anyway, I'm not the one to work out the ultimate theory of this. So, here's the latest game theory of how an instinct for friendliness could evolve. 

From Nature:

How Natural Selection Can Create Both Self- and Other-Regarding Preferences, and Networked Minds 
Thomas Grund, Christian Waloszek & Dirk Helbing 
Biological competition is widely believed to result in the evolution of selfish preferences. The related concept of the ‘homo economicus’ is at the core of mainstream economics. However, there is also experimental and empirical evidence for other-regarding preferences. Here we present a theory that explains both, self-regarding and other-regarding preferences. Assuming conditions promoting non-cooperative behaviour, we demonstrate that intergenerational migration determines whether evolutionary competition results in a ‘homo economicus’ (showing self-regarding preferences) or a ‘homo socialis’ (having other-regarding preferences). Our model assumes spatially interacting agents playing prisoner's dilemmas, who inherit a trait determining ‘friendliness’, but mutations tend to undermine it. Reproduction is ruled by fitness-based selection without a cultural modification of reproduction rates. Our model calls for a complementary economic theory for ‘networked minds’ (the ‘homo socialis’) and lays the foundations for an evolutionarily grounded theory of other-regarding agents, explaining individually different utility functions as well as conditional cooperation. 
... In conclusion, we offer an over-arching theoretical perspective that could help to overcome the historical controversy in the behavioural sciences between largely incompatible views about human nature. Both, self-regarding and other-regarding types of humans may result from the same evolutionary process. Whereas high levels of intergenerational migration promote the evolution of a ‘homo economicus’, low levels of intergenerational migration promote a ‘homo socialis’, even under ‘Darwinian’ conditions of a survival of the fittest and random mutations. The significance of local reproduction for the evolution of other-regarding preferences is striking and may explain why such preferences are more common in some parts of the world than in others.
Our modelling approach distinguishes between the evolution of individual preferences and behaviours. This makes cooperation conditional on the level of cooperation in the respective neigh-bourhood. Hence, when a few ‘idealists’ are born, who cooperate unconditionally, this can trigger off cooperation cascades, which can largely accelerate the spreading of cooperation33. Our model can also serve as a basis to develop an economic theory of other-regarding agents. The advantage is that it does not need to assume certain properties of boundedly rational agents—these properties rather result from an evolutionary process. In fact, our model naturally explains the evolution of individually different utility functions, as they are experimentally observed (see Figs. 3 + 4), and also the evolution of conditional cooperators9, 34. 
I'm not going to offer an opinion on whether their entire theory works or not. But it sounds like a game theoretic version in reverse of Stephen G. Bloom's book  Postville: A Clash of Cultures in Heartland America. Even though the New York media devotes a lot of effort to telling us all the time about Hate in small towns, you might start to suspect there's a bit of projection in that. Just walking down the street, you might think that people seem friendlier in smaller, more rooted places where they have to deal repeatedly with the same limited number of people.
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