Jewish Demographics

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Regarding the declining Jewish achievement, it looks like it can be primarily explained through demographics:

“Intermarriage rates have risen from roughly 6% in 1950 to approximately 40–50% in the year 2000.[56][57] This, in combination with the comparatively low birthrate in the Jewish community, has led to a 5% decline in the Jewish population of the United States in the 1990s.”

Jewish surnames don’t mean what they used to. And intermarriage rates are lowest among the low-performing and highly prolific Orthodox.

Jewish birth rates have been falling faster than the white population, especially for the non-Orthodox:

“In contrast to the ongoing trends of assimilation, some communities within American Jewry, such as Orthodox Jews, have significantly higher birth rates and lower intermarriage rates, and are growing rapidly. The proportion of Jewish synagogue members who were Orthodox rose from 11% in 1971 to 21% in 2000, while the overall Jewish community declined in number. [60] In 2000, there were 360,000 so-called “ultra-orthodox” (Haredi) Jews in USA (7.2%).[61] The figure for 2006 is estimated at 468,000 (9.4%).[61]”

“a very low fertility rate of 1.9, of which 1.4 will be raised
as Jews (2.15 is replacement rate)”

“As against the overall average of 1.86 children per Jewish woman, an informed estimate gives figures ranging upward from 3.3 children in “modern Orthodox” families to 6.6 in Haredi or “ultra-Orthodox” families to a whopping 7.9 in families of Hasidim.”

These statistics would suggest that half or more of Jewish children are being born into these lower-performing groups. Given their very low intermarriage rates, a huge portion of the secular, Reform, and Conservative Jews must be intermarrying (more than half if the aggregate 43% intermarriage figure is right). And the high-performing groups may now be around 1 child per woman or lower, and worse for the youngest generation.

So a collapse in Jewish representation in youth science prizes can be mostly explained by the collapse of the distinct non-Orthodox Jewish youth.

Incidentally, intermarriage also produces people with Jewish ancestry who get classified as gentiles using last names or self-identification, reducing Jewish-gentile gaps by bringing up nominal gentile scores at the same time as nominal-Jewish scores are lowered.

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