Resisting Birthrate Decline Through Culture: How one part of Japan bucks the trend
Japan's woes are well known, its population long in decline, it's economy stagnating.
Yet one prefecture continues to grow, not through policy but through a pronatal culture.
🧵, please share!
For more than forty years, Okinawa has had far higher fertility than any other prefecture (Stone, 2024).
But Okinawa's fertility used to be lower than the 🇯🇵 average (map by @yz7sha).
How did Okinawa manage to develop a pronatal culture, so different from the rest of Japan? 2/9
The story starts after World War II.
Unlike the United States or most countries that participated in the war, Japan never had a postwar baby boom, and a 2016 paper explains why.
Facing defeat and a loss of resources, Japan embarked on a crash program of population control. 3/9
Yet Okinawa and neighboring islands like Tokunoshima escaped the antinatal messaging experienced by the rest of postwar Japan. How? Because they were under temporary American rule!
As another 2016 paper explains,
"Okinawa's postwar history regarding fertility and family deviated from the path of Japan as a nation state. The demographic transition, and particularly fertility transition in Okinawa, started under not the Japanese but the U.S. military administration." 4/9
Okinawa has a share of large families (4 or more children) that is much higher today than any other part of Japan.
Large families are a key indicator of pro-natal beliefs. In the rich world most people don't have large families unless they believe in children! 5/9
Map: @yz7sha
A 2019 essay in the South China Morning Post goes further explaining Okinawan pronatal culture.
Belief in the importance of having children "is so great it outweighs the fact that Okinawa’s welfare policies for children are often less generous than in other regions." 6/9
The article goes on to emphasize the greater role of fathers in Okinawa, going against national norms.
This is significant. Nobel laureate Claudia Goldin cited the disproportionate burdens of working mothers in East Asia as a key cause of lower birthrates. 7/9
Finally, demographer Lyman Stone points out that women in Okinawa marry and have children earlier than in the rest of Japan, giving them more time to have more kids than elsewhere.
This in turn is due to less emphasis on long educations as compared to the rest of Japan. 8/9
Okinawa's uniquely pronatal culture goes a long way to explain how it manages healthy birthrates, in spite of family policies are less generous than in many other places in Japan.
What few realize is that Okinawa's time under American rule, in an era when the rest of Japanese culture was being transformed by population control efforts, allowed pronatal values to endure on the island even as they were being pushed out everywhere else. 9/9
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Colombia recorded only 445,000 births in 2024, way below UN projections of 701,000 births, for an official fertility rate of just 1.06 births per woman, and just 0.84 in Bogotá. (The true rate may be a little higher with unregistered births.)
Why such a dramatic collapse? 2/10
The biggest cause is the disappearance of marriage.
The rate of marriage in Colombia plunged to just 1.4 per 1000 people in 2022 according to OECD statistics, lowest in the world. (The US which has also seen a big drop still has a marriage rate 4 times as high at 6.0.)
3/10
On this Father's Day, let's think of young guys and the future.
How can young men, most of whom really want children one day, boost their odds of achieving fatherhood?
🧵!
Perhaps the first thing for young men to focus on is gaining income and building a career.
There is a strong positive relationship between a man's income and the number of children he will have.
This was true in the past and it is still true today, all over the world. 2/9
Part of this of course is that higher earning men are more attractive to women.
But even for among married men, studies find that when men earn more, they tend to have more children.
This isn't just some relic of the past. It is even more true for younger men! 3/9
UPenn economist @JesusFerna7026 just gave an important talk called The Demographic Future of Humanity.
Key points: (1) Birth data is much worse than the UN reports, (2) UN projections are absurdly rosy, (3) Economic growth will be low, and (4) Immigration cannot fix this.
🧵
First, Fernández-Villaverde notes that in country after country, the UN's birth figures are far higher than what those countries officially report.
For example, the Colombian government reports births 25% lower than what the UN claims. In Egypt and Türkiye, the gap is ~12%. 2/8
On top bad birth data, the UN's population projections are absurdly optimistic. In most countries birthrates have been dropping like a rock. Yet the UN projects birthrates will bounce right back up.
There is no evidence for this. The causes of low birthrates haven't reversed. 3/8
A wonderful paper by Spears et al. showed that population reduction would have almost no impact on climate change.
Why? The main reason is that a baby born today will emit much less carbon than someone born a generation ago, and their children will emit even less carbon. 🧵
Most previous forecasts of how population would impact climate assumed that carbon emissions would continue at the same rate indefinitely.
But per-capita carbon consumption has been falling sharply and will fall even faster in the future as renewable energy takes over. 2/4
Meanwhile, because of population momentum, total population takes decades to change meaningfully.
By the time depopulation kicks in, per capita carbon emissions will be much lower than they are today, and so the climate impacts of population by then will be much lower. 3/4
Knowing birthrates are driven by a stack of factors lets us figure out what is happening in each country and what its 👶 bottlenecks are.
Things like beliefs about children, marriage, housing conditions, religiosity, work culture and more all have a big impact.
🧵, please share!
In Spain (TFR 1.12), big hurdles include a huge fraction of young people living with their parents (driven by relatively poor employment for young people), the high share of housing that is small apartments, and declining faith among the young. 2/13
Poland (TFR 1.11) has a culture that is obsessive about work, with the longest work hours in Europe. After the fall of Communism, almost 70% of young Poles regularly practiced religion; today, less than 25% do. Housing is small and crowded. 3/13
Fertile No More!
For more than a hundred years, Ireland was both the most religious and the most fertile country in Europe.
But in recent years, Ireland experienced rapid secularization, and its fertility fell to just 1.47 in 2024.
What happened to 🇮🇪, and what comes next?
🧵!
First, a bit of history.
By the 1800s, Ireland had become almost entirely reliant on just one crop. Potato blight struck in 1845, and soon famine and mass migration cut the Irish population from 8 million down to 4. Ireland's population is still well below its 1845 peak. 2/7
Ireland gained independence in 1921, and Catholicism was central to Irish identity, partly in defiance of protestant England.
For most of the 20th century, 🇮🇪 was deeply religious, with church attendance above 90%.
The Irish idealized large families, and fertility was high! 3/7