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The demographic future of humanity: facts and consequences [pdf]

115 points| akyuu | 7 months ago |sas.upenn.edu | reply

400 comments

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[+] stego-tech|7 months ago|reply
Funny, I just wrapped a blog post about this: https://green.spacedino.net/i-dont-worry-about-population-de...

Good presentation by the author that reaffirms my own opinions about the topic, specifically that while it sucks and cripples the social welfare programs our (deceased) elders built on the theory of continued population and productivity growth, it's also an issue we can fix with coordination between powers and workers. It's about building a new environment that puts families, rather than employers, first, and encouraging participation in the creation and maintenance of that environment by everyone regardless of age or demographic. The return of third places, social events, volunteerism, clubs, transit, public gatherings, stay-at-home parents, and more.

And as I've seen others point out in regard to the biological procreation imperative, we as a species are wired to breed. For all the whining from puritans about pornography, I'm of the opinion that its proliferation and normalization in fact reflects a deeply-held urge of humanity to have more time to have sex and live authentically again, whatever that may look like to the individual or family unit. Humans clearly want sex, and families, and time off, but the current global civilizational model is work > all, and thus families have taken a backseat to GDP growth at all costs.

[+] h2zizzle|7 months ago|reply
I'm a single, gay man. During two of my last major existential crises, for about two weeks following, I noticed a marked turn of my thoughts and feelings towards having (biological) children. Stuff like, "If I'd had a kid at such-and-such age, how old would they be now?", "How would I manage if a child was suddenly in my life?", and "Oh god, my line stops with me panic". For a number of reasons, I am extremely unlikely to ever have kids; it would take a change in my prospects so massive that I can't really conceive of it. For this reason, I have come to feel that there may be a common (often irrational) biological impulse to procreate.

But now that I get to the bottom of my message, it occurs to me that it might be tangential, since you're talking about sex, which is related to but encompasses a far larger category of activity than just procreation. Speaking through my lgbt lens (and again, probably tangentially) this false conflation creates at least the dual issues of the incorrect ideas that sex should only be for procreation, as well as the the incorrect idea that queer people can't (or shouldn't) be parents. Here's hoping that both get nixed as we rethink the role of sex, and the importance of family, in society.

Just some rambling, don't mind me.

[+] chrisco255|7 months ago|reply
The fertility rate is falling everywhere, even countries that have extensive childcare and maternity/paternity leave. Sweden grants 68 weeks of shared parental leave and their TFR is at 1.45.

There is nothing authentic about porn, what a strange comment. Sure, it hacks the reward system of the brain in the same way that a slot machine does, but this does absolutely nothing to promote families.

[+] NoGravitas|7 months ago|reply
This friend speaks my mind. Population decline is, on the whole, Good for humanity, in many, many ways. It's just bad for an economic system predicated on permanent growth, forever. That system was always doomed - if it weren't for demographic decline, it would just hit hard resource limits sooner. On the whole, I would much rather human population gradually decline through falling births, than precipitously crash through rising deaths.
[+] agalunar|7 months ago|reply
I’ve noticed that, besides the magnetism and drive for sex (which would be sufficient for a species to propagate), many people also experience the biological imperative (wanting their genes replicated) as its own separate feeling.

This makes no sense to me – it’s not a feeling I can personally relate to. I’d like to raise kids because I’d enjoy getting to teach them and share things with them, but I don’t care whether they are my biological children or not.

So it’s something I’ve wondered about. The likely why makes sense, but I don’t really get the what.

[+] lotsofpulp|7 months ago|reply
> we as a species are wired to breed.

Wired to orgasm, maybe. Wired to breed, no. According to all the data.

Humans are very analytical and do tons of cost benefit analysis before breeding, and apparently, choose not to in many cases.

[+] aprilthird2021|7 months ago|reply
> it's also an issue we can fix with coordination between powers and workers

Which is severely lacking in the most powerful nation on Earth

> It's about building a new environment that puts families, rather than employers, first, and encouraging participation in the creation and maintenance of that environment by everyone regardless of age or demographic.

Again, never going to happen in the USA at least.

The current human model is work > all because we are a capitalist system, and we reward greed because it's the best economic system we put up so far. There will be powerful interests fighting this and pushing all the costs of this heavy system failure onto their workers and consumers etc. and that's the whole problem we are facing...

[+] mensetmanusman|7 months ago|reply
“the ruling classes chose to ignore its symptoms out of convenience until the problem became insurmountably difficult to solve”

Not only the elite, but all the voters who don’t care because the elite told them large populations were dangerous. I still meet so-called smart college educated people that think a large population crisis is coming.

[+] swat535|7 months ago|reply
Here is an uncomfortable truth: religious people produce more children, regardless of their income, social welfare status and living conditions. They are thought from birth that marriage, family and children are gifts from "God".

In fact, Christians make it a _requirement_ to be "open to life" (i.e have children) before they agree to marry you in Church (in addition to banning contraceptives, abortions and porn).

They also believe that pursuit of wealth, status and greed is a sin and one should focus his attention inward , towards "God", "Family", and "Charity".. disincentivizing people from dedicating their lives to their careers and missing their chances of having kids. is it no surprise then, that they ten to have larger families?

What I'm trying to highlight here, isn't a celebration of religious practices but the fact that we need a massive cultural shift, first and foremost to resolve this issue and if I'm being honest, I don't see this happening anytime soon.. at least not in our hyper capitalist society.

I'm not sure many people (especially women) are willing to sacrifice their lifestyles, career aspirations and goals to have children.

Unless people are taught from birth that having kids is their sole purpose in life and that family, motherhood and communities are deeply celebrated by society, they will opt out of having kids.

[+] thewanderer1983|7 months ago|reply
The last line of the slide reads "Once you start thinking about these issues, it is hard to think about anything else: demography is destiny."

Raoul Pal primary thesis about macroeconomics is that Demographics is everything. Here is a 54 second video of him highlighting that issue.

https://www.youtube.com/watch?v=vJm_zFbIqPE

[+] mensetmanusman|7 months ago|reply
GDP = people * productivity

I’m super interested on the economic modeling when every society is shrinking.

In that case, the best index fund will be the one that shrinks the slowest. This will happen about 10 years after the average reader here dies.

[+] pmarreck|7 months ago|reply
Maybe expecting every single person to work and no one to homestead and care for the kids, within a system that explicitly does not support families, was a mistake. (Please note that I did not gender the roles. My best friend is a stay-at-home dad and he is amazing. They can afford to do this, though, because his wife's compensation is extremely high.)
[+] nradov|7 months ago|reply
Expectations are part of it, but regardless of compensation or lack thereof it turns out that a lot of adults simply prefer to work outside the home instead of caring for children. Child rearing is essential, and rewarding in many ways. But it's also exhausting, repetitive, and frustrating. It's not surprising that given the choice many adults would rather spend time around other adults instead of children. In the past most societies kind of "solved" this inherent problem by artificially restricting women's but obviously that's not acceptable or even feasible now.
[+] thrance|7 months ago|reply
No matter the gender of the one staying at home, it creates a problematic power imbalance between the two parts of the couple, where one depends on the other and may be left in trouble if ever the couple should find an end.
[+] Animats|7 months ago|reply
The future is probably a society with more robots than humans.

We can see this happening now at Amazon. Amazon is a good case to watch, because their operations replace humans with robots on close to a one to one basis. Right now, Amazon has about 1.5 million human employees, and 1 million robots. Amazon reached peak humans in 2022, with around 1.6 million employees. Then human employees began to decline slightly. Robots continue to increase. Here's an old chart from 2017, when Amazon had increased all the way to 45,000 robots and some people were worried.[1] Now, it's 20x that.

How a society of mostly robots will work is not clear, but it's coming anyway.

[1] https://www.statista.com/chart/7428/45000-robots-form-part-o...

[+] robots0only|7 months ago|reply
The 1 million robot number that Amazon keeps on using is a quite nuanced. It includes more ~800K robots that simply just move stuff in a 2D plane. I think the number of robots that actually manipulate things is far far less (probably less than 500) (but really no human wants to just move things from A to B).

Also, I completely agree with what you said. Cars (w/ no self-driving) can be thought of as primitive robots (just like robots of today). For good or bad, we will move towards more and more automation.

[+] pasquinelli|7 months ago|reply
they should form a union
[+] baron816|7 months ago|reply
The mid-century Baby Boom occurred after a surge in affordable home keeping technologies (vacuum cleaners, washing machines, refrigerators, etc). I think a rebound in fertility will have to come from technology. Specifically, robots to help with child care and new fertility treatments to allow women to have children later in their lives.
[+] ch4s3|7 months ago|reply
The mid-century Baby Boom came after WWII, and probably had very little to do with technology. The upswing started some time in late 1944 to mid 1945 as combat was winding down in Europe and a lot of young men were returning home. Otherwise fertility has been declining steadily since 1800 in western countries.
[+] lynx97|7 months ago|reply
Late child birth is not about fertility but about risks for the child. The only woman I know (yeah, anecdotes) who attempted to delay getting a child until after her 40th birthday got a baby with down syndrome. I know what living with a disability in our world means, from personal experience. And given that experience, I have a hard time giving these women some slack. I think they are risking the well being of their children just for their own selfish reasons. We are humans, and there are limits to what we can do. We need to accept them, or we will make other people suffer.
[+] xp84|7 months ago|reply
While I wouldn’t like to place all my faith in that happening, that would certainly be a great development.
[+] WalterBright|7 months ago|reply
Baby booms normally happen after a big war. After all the death, people have a primal urge to procreate.

I read that people were copulating in the streets of London the day of the Armistice.

[+] mindslight|7 months ago|reply
> robots to help with child care

Tell me you don't have kids without telling me you don't have kids.

From an "efficiency" perspective, one can already eliminate 90% of the work of childcare by putting your kid in a sturdy playpen with a secure hard top and wearing noise canceling headphones. People don't really want to do this, for the most part.

The interactive learning is the entire point of childcare. Having machines raise your kids will make it so you end up with kids that were raised by machines. Is that what you want? It seems like this is basically already a thing, with the varying amounts of screen time that parents will allow kids.

[+] adriand|7 months ago|reply
My concern is the intersection of rightwing natalism with Silicon Valley ideology leading to technological “solutions” involving, essentially, test tube babies. Take women out of the picture entirely. I can especially see a dystopian dynamic involving the “we have to compete with China” or “they’re doing it / about to do it in China” narratives.
[+] seydor|7 months ago|reply
if we have all those robots doing everything for us, why do we need children?
[+] pfdietz|7 months ago|reply
For a technological solution, I've previously suggested changing the male/female ratio of new births. Filter out most of the Y bearing sperm cells.

In this new imbalanced society, a TFR well below 2 will still allow a stable, or even growing, population.

[+] A_D_E_P_T|7 months ago|reply
I'm probably going to get in trouble for this, but the population numbers and statistics for Africa are totally unreliable. Fertility and total population are all wrong.

The DRC is said to have 100M people, but check out satellite imaging. There's no chance -- and I mean none -- that it actually has 100M people. Unless 9-out-of-10 inhabitants live in the woods under tree cover, the actual population of the country is probably closer to 10M.

You don't have to take my word for it. Look for yourselves. And take an satellite shot of Kinshasa (reported population ~19M), rotate or mirror-image it, and then ask GPT-5 to estimate its population. Also, compare for yourself vs. a place like Shanghai. (Reportedly just 20% more populous, but also visibly denser and roughly an order of magnitude larger.)

Many other countries in the region, like Nigeria, are much the same way. The population numbers don't line up with satellite imaging.

Then there are obvious economic measures, etc.

The unavoidable conclusion is that the numbers for Africa are maximally unreliable. There are various reasons for this that we can speculate on (foreign aid dependent on population numbers, etc.), but, anyway, at least take 'em with a grain of salt.

[+] joegibbs|7 months ago|reply
Zoom in on Kinshasa though and you can see that it's almost entirely very densely-packed slums and shantytowns built up against each other, about 100 - 250 square meters in size, with no gardens or back yards. Slums can be very dense, Dharavi in Mumbai 2.3 square KM with a population of about a million. Manhattan has a much lower population density now than 100 years ago.

Also in all the street view pictures it looks absolutely packed - every road is gridlocked with people everywhere, but Shanghai has a lot of empty space for people despite its size. Roads have trees, they're much wider, there are a lot of open parks, office buildings etc that Kinshasa wouldn't have.

[+] testing22321|7 months ago|reply
I drove right around Africa through 35 countries over three years. I drove across both Nigeria and the DRC.

There are dozens and dozens of massive cities that take hours to cross in Nigeria you’ve never heard of. Anecdotally, it’s way, way, way more populous than anything nearby. Ethiopia felt somewhat similar in parts, as did Egypt.

[+] churchill|7 months ago|reply
Thank you for this. Nigerian here, and I have to say that you hit the nail squarely on the head. Population counts in Nigeria are deeply political and essentially every region/state is motivated to fake/overestimate their headcount to get a bigger chunk of the oil revenue, which is pretty much the most significant slice of gov. revenue.

But, once you dig into the figures, you realize it'd be a miracle if Nigeria has up to half of the population it claims.

Every single census that's been conducted has been marred by controversy, with states trying to buff up their populations to make their ethnicity/region look bigger and more important.

But, proxies like registered BVN (like Social Security Number, but for bank accounts) are just under 70M. Registered phone lines (~240M; each person usually owns 3-5) are similarly lackluster. Domestic demand is nothing to write home about if you run a CPG business. Zoom into a satellite view of a city that's supposed to have ~700k to 1M people and it looks like a suburb - just scanty.

Nigeria's most populous city claims to have 20M people - 2* the population of Seoul, one of the most urbanized, dense, vertical cities in the world, meanwhile, Lagos is just a sprawling slum.

Personally, I feel population counts across Africa are grossly overestimated. A good estimate would be 600-800M, but where's the fun in that when we can fearmonger about overpopulation?

[+] adriand|7 months ago|reply
I just did what you suggested and looked at Kinshasa and it looks HUGE to me. Endless rows of streets. Reminded me of Mexico City (and I just compared satellite imagery and they seem similar in that respect - and they are similar in terms of population). Big cities with few skyscrapers and tons of low rise buildings are quite common. In the west, Paris is an example of a populous city without many tall buildings.
[+] padjo|7 months ago|reply
The arrogance of a comment like this is staggering. So you looked at some satellite photos and talked to ChatGPT and now you’re an expert on the demographics of a city? Crazy.
[+] TrackerFF|7 months ago|reply
Ironic as it may sound, coming from a childfree millennial, I'm kind of puzzled how the system will survive. Both my grandparents died in their 90s, and spent over 30 years are retirees - mainly living off their state pension.

As people become older, they'll either have to work longer, or the system will come crashing down. Especially with lower fertility rates. My generation should be birthing kids as the previous ones, but I think almost half of my peers are childfree, too. And we're in the age that we have maybe - if lucky - 6,7 more years to reproduce.

I can't imagine a population where 1/3 will be retired people. It is also a huge drain on the healthcare system.

[+] rendang|7 months ago|reply
The selection effects of this transition will be really fascinating to see after the fact. The species has spent a long time under selection pressure for "having more kids", but is being subjected for the first time to "having more kids while extreme prosperity and modern telecommunications exist" which is a very different thing.
[+] api|7 months ago|reply
Paul Ehrlich was almost exactly wrong about everything, but he continues to frame the discourse to a ridiculous degree. I'm not sure what the magic pixie dust is that allows people to be this wrong and still have credibility.
[+] tsoukase|7 months ago|reply
Everything is hostile to having kids. High consumer prices and house rents, media and celebrities advertising short term pleasures, big city way of life in anonymity entertaining alone until death, latest social trends in gender roles, low state financial support to families.

There must take place fundamental social reforms in order to reverse this path. The most important is to create working mothers and not dynamic but single women.

[+] neaden|7 months ago|reply
I remember when I was younger being constantly told that the earth was destined for overpopulation. That if we didn't do things soon to curb fertility there was going to be mass starvation and death. That this was just an inevitability, a certainty unless something was done. There were so many visions of the future based on overpopulation and the problems it would bring. Now we've switched to the opposite side, I never even got to enjoy the apparently brief moment when things were exactly right.

I say all this not to say that this article and all the worries about demographic decline must be fake/overstated, but I don't like the certainty that we just switched our worries from one extreme to the opposite.

[+] giantg2|7 months ago|reply
Little mention of automation in the labor discussion. Also, no real discussion of the consumerism aspect of the economy when talking about worker productivity.

Depopulation shouldn't be a big deal when it's decades away and will be a slow decline.

[+] retrocog|7 months ago|reply
This trend doesn't bode well for the long term survival of the social welfare state.
[+] Arainach|7 months ago|reply
The complaining about fertility rates, mostly done by the chunk of the population hoarding more and more of the wealth, will continue until people's ability to afford rent and children improves.
[+] LAC-Tech|7 months ago|reply
I feel like slide 39 would have gotten you chased out of polite society 10 years ago.

A lot of western countries economies are built on sustained mass migration. Australia, Canada, New Zealand. Arguably the United States where both parties champion it (turn the other check to illegal migraiton of the democrats VS mass H1B visas of the republicans).

As this study points out, it's not sustainable.

[+] neehao|7 months ago|reply
one small thing = https://bfi.uchicago.edu/wp-content/uploads/2024/11/BFI_WP_2...

and haha on “The “rebound” in future fertility for low-fertility countries is consistent with an expectation of continued progress toward gender equality and women’s empowerment and improving social and economic opportunities for young people and families.”