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The '''dysgenic fertility''' theory posits an inverse relationship between intelligence and fertility (Lower intelligence people having more children).

The '''dysgenic fertility''' theory posits an inverse relationship between intelligence and fertility (Lower intelligence people having more children).

As far as dysgenic fertility (people with lower intelligence having more children) and its effect on population's intelligence, the abstract for journal article ''IQ and fertility: A cross-national study'' published in the journal ''Intelligence'' states: "Many studies have found a small to moderate negative correlation between IQ and fertility rates. However, these studies have been limited to the United States and some European countries. The present study was a between-nation study using national IQ scores and national fertility rates. There were strong negative correlations found between national IQ and three national indicators of fertility."<ref>Abstract for journal article ''Intelligence'', [https://www.sciencedirect.com/science/article/abs/pii/S0160289607000244#:~:text=Numerous%20studies%20have%20confirmed%20that,with%20higher%20levels%20of%20IQ. IQ and fertility: A cross-national study] by Steven M. Shatz, Volume 36, Issue 2, March–April 2008, Pages 109-111</ref>

As far as [[dysgenic]] fertility (people with lower intelligence having more children) and its effect on population's intelligence, the abstract for journal article ''IQ and fertility: A cross-national study'' published in the journal ''Intelligence'' states: "Many studies have found a small to moderate negative correlation between [[IQ]] and fertility rates. However, these studies have been limited to the United States and some European countries. The present study was a between-nation study using national IQ scores and national fertility rates. There were strong negative correlations found between national IQ and three national indicators of fertility."<ref>Abstract for journal article ''Intelligence'', [https://www.sciencedirect.com/science/article/abs/pii/S0160289607000244#:~:text=Numerous%20studies%20have%20confirmed%20that,with%20higher%20levels%20of%20IQ. IQ and fertility: A cross-national study] by Steven M. Shatz, Volume 36, Issue 2, March–April 2008, Pages 109-111</ref>

The abstract for the journal article ''Do high-status people really have fewer children? : Education, income, and fertility in the contemporary U.S'' published in the journal ''Human Nature'' states:

The abstract for the journal article ''Do high-status people really have fewer children? : Education, income, and fertility in the contemporary U.S'' published in the journal ''Human Nature'' states:

An excerpt for abstract for the journal article ''The decline of the world's IQ'' published in the journal Intelligence by Richard Flynn and John Harvey states:

An excerpt for abstract for the journal article ''The decline of the world's IQ'' published in the journal Intelligence by Richard Flynn and John Harvey states:

{{Cquote|Dysgenic fertility means that there is a negative correlation between intelligence and number of children. Its presence during the last century has been demonstrated in several countries. We show here that there is dysgenic fertility in the world population quantified by a correlation of −0.73 between IQ and fertility across nations. It is estimated that the effect of this has been a decline in the world's genotypic IQ of 0.86 IQ points for the years 1950–2000. A further decline of 1.28 IQ points in the world's genotypic IQ is projected for the years 2000–2050. In the period 1950–2000 this decline has been compensated for by a rise in phenotypic intelligence known as the Flynn Effect, but recent studies in four economically developed countries have found that this has now ceased or gone into reverse. It seems probable that this “negative Flynn Effect” will spread to economically developing countries and the whole world will move into a period of declining genotypic and phenotypic intelligence.<ref>[http://www.iapsych.com/iqmr/fe/LinkedDocuments/lynn2008.pdf The decline of the world's IQ] by Richard Flynn and John Harvey, Intelligence 36 (2008) 112–120</ref>}}

{{Cquote|Dysgenic fertility means that there is a negative correlation between intelligence and number of children. Its presence during the last century has been demonstrated in several countries. We show here that there is dysgenic fertility in the world population quantified by a correlation of −0.73 between IQ and fertility across nations. It is estimated that the effect of this has been a decline in the world's genotypic IQ of 0.86 IQ points for the years 1950–2000. A further decline of 1.28 IQ points in the world's genotypic IQ is projected for the years 2000–2050. In the period 1950–2000 this decline has been compensated for by a rise in [[Phenotype|phenotypic]] intelligence known as the [[Flynn Effect]], but recent studies in four economically developed countries have found that this has now ceased or gone into reverse. It seems probable that this “negative Flynn Effect” will spread to economically developing countries and the whole world will move into a period of declining genotypic and phenotypic intelligence.<ref>[http://www.iapsych.com/iqmr/fe/LinkedDocuments/lynn2008.pdf The decline of the world's IQ] by Richard Flynn and John Harvey, Intelligence 36 (2008) 112–120</ref>}}

== Notes ==

== Notes ==

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[[Category: Sociology]]

[[Category: Sociology]]