An interesting perspective on the declining birth rate in first world countries is that organisms probably don't just optimize for number of offspring but also for their place in the food chain.
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I think that may be part of the equation but I know parts of the first world which use this only to guide between say 2, 3 or 4 children independent of projected future status. Ever been to Fort Worth, or St. Louis, or San Antonio?So not universal, imo.
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I think that the socioeconomic identification may be a community if you are religious. Most urban people just mix that up with income and education brackets, because that is what defines their community access.
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