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Idiocracy Is an Old Friend
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Jayman has an interesting post showing that the positive correlation between fertility and political conservatism has existed in the US for nearly a century. Rifting off of this (okay, okay, copying it!), presented below are similar graphs tracing the relationship between fertility* and a couple of other angles I’m interested in–intelligence and educational attainment. To allow for family formation to have occurred, racial confounding to be avoided, and linguistic problems to be evaded, all included respondents were at least aged 35 at the time of their participation, non-whites are excluded, and the foreign-born are disregarded, respectively.

Firstly, fertility and intelligence by decade(s) of birth:

The dysgenic trend isn’t anything new. We’ve putatively been moving towards Idiocracy for a century now. I use the qualifier because it is by no means clear that the average IQ of white Americans has declined in the last 100 years–to the contrary, it has probably increased.

Parenthetically, I find it neat to see the phrase “baby boomer” really come alive with the data.

And fertility and educational attainment by decade(s) of birth:

The correlation between education and fertility is much stronger than the correlation between intelligence and fertility is. The sixties cohorts illustrate this particularly well in the two graphs presented above. Of the 25 bars displayed in the latter graph, only two buck the otherwise perfect pattern of more education resulting in fewer children, and they are minor (“some college” among those born 1900-1919 and “bachelor’s” among those born in the fifties). In the former graph showing the interaction between intelligence and fertility, there are several exceptions.

Here’s to the education bubble bursting and a much more efficient, industrious method of imparting skills and knowledge to those rationally seeking them rising out of the dampness. The current structure isn’t just financially wasteful and morally destructive–instilling in young adults a sense of entitlement to go along with a heavy debt burden and little in the way of marketable capabilities or competencies–it also plays a starring role in the death of the west.

* The averages are systematically overstated here as the GSS instructs survey participants to count not only their biological children but also step-children and those they’ve adopted.

GSS variables used: COHORT(1900-1919)(1920-1939)(1940-1949)(1950-1959)(1960-1969), WORDSUM(0-3)(4-5)(6)(7-8)(9-10), EDUC(0-11)(12)(13-15)(16-17)(18-20), BORN(1), RACE(1), CHILDS, YEAR(1985-2010)(1995-2010)(2005-2010)

(Republished from The Audacious Epigone by permission of author or representative)
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  1. Maybe it's just my lying eyes, but it looks to me like the dysgenic IQ trend disappeared by the '60s.

  2. Anonymous • Disclaimer says:

    Ah, the fertility gap. Solving this could fix all the other gaps. If you have fewer low performing people then it is easier for them to get the support they need. As low performers increase, their needs increase as the wherewithal to meet those needs decreases. Back in the day, there were wars of attrition that these folks were sent off to. Sorry, but it is true. That left a bunch of women, many of whom were not desirable as mates for males of any higher class and therefore had fewer children than if they had married.

  3. This data suggests previous dysgenic-fertility was reversed among 1960s-born U.S. Whites (Judging by the IQ graph). They were of reproductive age in an era of easy-contraception, abortion, and the HIV Scare.

    Abortion/Contraception: Eugenic?

    Their final TFR was quite below replacement, though.

  4. AP and Hail,

    Yes, important observation that I should've made. Though excepting the low "real dumbs" number (which is the smallest sample of the 50 presented with 35 respondents), the trend isn't eugenic, it's not obviously dysgenic, either.

  5. It should be noted that mortality is eugenic, especially in the early years of your sample. One's risk of dying before having kids is substantially higher if you have a lower IQ or education level.

    I think this also helps gives an apparent IQ boost to oldsters. For the old cohorts, the lower IQ among them have disproportionately died out.

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