Why do most cultures have a class structure rich, poor and sometimes middle instead of being egalitarian, with resources shared equally by everyone?
According to Stanford University researchers, it is the very inequities of the class structure that appear to have been behind the spread of those societies and the displacement of more egalitarian cultures during the early era of human civilization.
The researchers used a computer simulation to compare demographic stability and rates of migration for both egalitarian and unequal societies. They found that class structure provided unequal access to resources, thereby contributing a destabilizing effect on the population, and driving migration and the expansion of stratified societies.
"This is the first study to demonstrate a specific mechanism by which stratified societies may have taken over most of the world," said Marcus Feldman, an evolutionary biologist at Stanford. He is a co-author of a research paper on the topic, published online this week by the Public Library of Science in the journal PLoS ONE.
Feldman and his colleagues determined that when resources were consistently scarce, egalitarian societies which shared the deprivation equally throughout the population remained more stable than stratified societies. In stratified societies, the destabilizing effect of unequal sharing of scarce resources gave those societies more incentive to migrate in search of added resources.
In environments where the availability of resources fluctuated from year to year, stratified societies were better able to survive the temporary shortages because the bulk of the deprivation was absorbed by the lower classes, leaving the ruling class and the overall social structure intact. That stability enabled them to expand more readily than egalitarian societies, which weren't able to adapt to changing conditions as quickly.
Many possible causes for the development o
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