Civilizationally homogeneous regional groups outperform heterogeneous ones

Evidence

Secondly, similarity in habits and customs, beliefs and thoughts, is not enough to constitute men into society. Things may be passed physically from one to another like bricks. In the same way habits and customs, beliefs and thoughts of one group may be taken over by another group, and there may thus appear a similarity between the two. Culture spreads by diffusion, and that is why one finds similarity between various primitive tribes in the matter of their habits and customs, beliefs and thoughts, although they do not live in proximity. But no one could say that because there was this similarity, the primitive tribes constituted one society. This is because similarity in certain things is not enough to constitute a society. — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 875 (#complicates, via linked claim)

As in the real world, these simulations do not involve an omniscient being who has complete knowledge of the environmental space and can assign group memberships in a way that ensures an optimal group size. Instead, individual agents make choices based on the choices of other agents, and the result can sometimes be less than desired, as was the case in the simulations presented here. — Roderick M. Kramer, Geoffrey J. Leonardelli, Robert W. Livingston, Social Cognition, Social Identity, and…, 842 (#complicates, via linked claim)

Categorization

• XREF: connects to: Regional organizations succeed in inverse proportion to civilizational diversity; In-groups can cohere by homogeneity or by shared structure — Roderick M. Kramer, Geoffrey J. Leonardelli, Robert W. Livingston, Social Cognition, Social Identity, and…, 1620; Cultural accumulation locks groups into local optima because traits are integrated (+5 more)

Broader Connections

• Cultural similarity from diffusion does not make groups one society #complicates (0.76) — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 875
• Cultural accumulation locks groups into local optima because traits are integrated #complicates (0.74)
• Decentralized choice without global coordination yields suboptimal group outcomes #complicates (0.71) — Roderick M. Kramer, Geoffrey J. Leonardelli, Robert W. Livingston, Social Cognition, Social Identity, and…, 842