September 2021 PMID 34914431

Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation.

Amanda Rotella, Michael E W Varnum, Oliver Sng, Igor Grossmann

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Mentions

118
Peak: 19 in Jan 2021
across 3 sources since Aug 2020

Extended reach

622,722
potential audience

Total likes

230

Video views

78

Mentions per month

Aug 2020 – Oct 2025

Where it's discussed

  • X / Twitter115 posts
  • YouTube2 videos
  • Bluesky1 posts

AI synopsis

What people are saying

Participants in the discussions frequently reference established correlations between population density and fertility rates, with phrases like 'density is robustly correlated with lower fertility' appearing in multiple comments. The tone is predominantly analytical, with one user stating that 'population density has a strong negative correlation with fertility rates,' which suggests a serious consideration of the data. Others express concern over the implications of densification, noting 'mass densification means less kids' and 'we already don't have enough kids,' indicating urgency and concern about future societal outcomes.

AgreementModerate agreement

Many discussions reflect a general consensus that higher population density is linked to reduced fertility rates, with participants referencing previous studies that support this viewpoint.

InterestHigh interest

Participants demonstrate high interest in the topic, as evidenced by numerous comments engaging with the data and implications of the study.

EngagementModerate engagement

The engagement level is moderate, with some users discussing methodologies and broader societal implications, though some remarks are more surface-level.

ImpactHigh impact

The discussions indicate a strong belief that the findings have significant societal implications, particularly regarding urban planning and family formation.

Abstract in brief

  • Fertility rates are declining worldwide over the past 50 years as part of the demographic transition, with a study analyzing data from 174 countries from 1950 to 2019 showing a clear link between population density and fertility.
  • The research indicates that higher population density correlates with lower fertility rates, even when accounting for various factors like socioeconomic conditions and female empowerment.
  • However, this relationship is influenced by environmental factors, such as living conditions and cultural aspects like religiosity and social norms, suggesting these factors can moderate the impact of population density on fertility rates.

Top posts

Most liked on X and Bluesky
Emil Kirkegaard
@KirkegaardEmil · X

Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. Optimize enough and you die out Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation https://t.co/uZoN6TTFun

Jan 8, 2021 · 93 likes · 25 shares · 45,406 followers View post →
Tarric Brooker aka Avid Commentator
@AvidCommentator · X

@clairlemon 'Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation' https://t.co/nlQ2P00ADr

Aug 14, 2025 · 58 likes · 4 shares · 39,001 followers View post →
Nicky P
@cravecreative · X

2/ What is densification's END goal? Bio-Surveilance? Digital Tracking? Global Food Banks? Personal Carbon Tracking? Population Reduction? Indeed. "Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation." https://t.co/gEnAcdKprr

May 29, 2024 · 9 likes · 3 shares · 21,998 followers View post →
Suze
@STSue63 · X

@DVATW When a population starts to reach high density birth rates fall. There are too many humans on the planet. https://t.co/IoAK3Ho8T8

Feb 13, 2023 · 9 likes · 229 followers View post →
David Schmitt
@PsychoSchmitt · X

"Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation" https://t.co/IG5qtawAL7 https://t.co/OLjAd53fV6

Aug 10, 2020 · 6 likes · 2 shares · 12,461 followers View post →
Anastasia
@demystifysci · X

@robinhanson @MaxCRoser It's a question of the effect of density on reproduction, which is a common feature of animal populations. Seems to hold in humans, too, which suggests that there's a feedback loop that has nothing to do with tech: https://t.co/BVctvVEeRz

Aug 5, 2023 · 5 likes · 4,357 followers View post →

All mentions

Angry White Californian
@RyanLikesCats81 · X

@jonatanpallesen @Jerinos1 No, dude. Tons of studies show that increasing population density decreases fertility rates across species. This is instinctual population control stuff. The fact that rich people tend to get big apartments and buck the trend doesn’t change that fact. https://t.co/DeqWbZOgW4

Oct 3, 2025 · 1 like · 582 followers View post →
Norman Angleson
@AnglesonNorman · X

https://t.co/s6lHnpAReq https://t.co/dWJhbO8gvD https://t.co/yV7MWJTFWj https://t.co/6VfuwIzEWj

Sep 8, 2025 · 2 likes · 1,867 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@StefanFSchubert @jburnmurdoch I respect the general point (you have no obligation to include a control). In my specific case, it's not a pet theory at all... tight relationships between density and lower birth rates are well established: https://t.co/LP6b1h7RNK As is density & politics:

Aug 29, 2025 · 2 likes · 237 followers View post →
Neocon Sally Rooney stan account
@NeoconMaudit · X

https://t.co/DIF16PN9nm [via https://t.co/xPYP3BMVoa] https://t.co/8ikGHXrJ2R

Aug 15, 2025 · 918 followers View post →
Holtz
@Biorealism · X

RT @AvidCommentator: @clairlemon 'Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation'…

Aug 15, 2025 · 4 shares · 8,911 followers View post →
ChristPimpHands
@ChristPimp · X

RT @AvidCommentator: @clairlemon 'Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation'…

Aug 15, 2025 · 4 shares · 140 followers View post →
Crocodile
@Crocodylus121 · X

Densification - the solution nobody wants to the problem we don’t need to have. https://t.co/Ue2Qr6VfjX

Aug 14, 2025 · 4 likes · 1,154 followers View post →
Mr Blønde
@NewNorm89 · X

@clairlemon https://t.co/ODQ5BKXgwr

Aug 14, 2025 · 1 like · 971 followers View post →
Debra Suprean
@DebraSuprean · X

RT @AvidCommentator: @clairlemon 'Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation'…

Aug 14, 2025 · 4 shares · 1,092 followers View post →
Claire Lehmann
@clairlemon · X

RT @AvidCommentator: @clairlemon 'Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation'…

Aug 14, 2025 · 4 shares · 248,389 followers View post →
Tarric Brooker aka Avid Commentator
@AvidCommentator · X

@clairlemon 'Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation' https://t.co/nlQ2P00ADr

Aug 14, 2025 · 58 likes · 4 shares · 39,001 followers View post →
Giles
@gdeejay.bsky.social · Bluesky

Average income and density tend to be positively correlated, so I'd have imagined this explains a lot of it. But, there seem to be research that suggest a relationship between the two even when correcting for other factors: pubmed.ncbi.nlm.nih.gov/34914431/

Aug 5, 2025 · 1 like · 1 share View post →
Technosophie - auto/acc
@OrielJohann · X

@MacLesggy @ClementGaill https://t.co/zhFdK2ZBKI We find a causal relationship from population density to fertility such that a rise in density from 10 to 1000 inhabitants per square kilometer corresponds to a decrease in fertility of about 0.7 children. https://t.co/FMrbZZygxW

Jun 19, 2025 · 1,006 followers View post →
Loki
@Loki74576878999 · X

@YuriyMatveyev @pavlov_vitali Да ладно! Это ОДИН (не единственный) из факторов, отрицательно влияющих на рождаемость. Поэтому Юж.Корею с нами сравнивать смешно. Вот исследование по 174 странам "Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation" https://t.co/f0Tn9OtqAb

May 21, 2025 · 2 followers View post →
Darren Quinn | Modern Money Educator & Analyst
@AusMMT · X

@DrCameronMurray Population Density, Fertility and Demographic Convergence in Developing Countries - https://t.co/9xXyKaMooG PDF) Population Density Key Factor in Declining Human Fertility - https://t.co/hPoNLqdjh1 Increasing population densities predict decreasing fertility rates over time: A

Apr 7, 2025 · 1 like · 2,706 followers View post →
LorenzoFromOz
@LorenzoFrom · X

@DrCameronMurray @signifer111 Accessible link https://t.co/NXSYJoNXo4

Apr 7, 2025 · 1 like · 979 followers View post →
Jay Nonymous
@sglockenspeil · X

@HugoVale_ @AutismCapital Population density may be a contributing factor. Science is still trying to work this one out. Hey, we still can’t figure out why more boys than girls are born following major wars. It statistically doesn’t make sense. https://t.co/RYrHwBAijz

Jan 24, 2025 · 966 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@ShabbatSlalom @benmyers29 Densifying demonstrably makes it worse, both within countries and between countries. Taking a tire fire (our existing fertility rates of 1.3) and pouring gasoline on it is a terrible idea. https://t.co/j19bQTG9IL.

Nov 9, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@benmyers29 @ShabbatSlalom Density is robustly correlated with lower fertility, both within country and between countries. https://t.co/j19bQTG9IL. Signing up for mass densification destroys our long term social safety ned.

Nov 9, 2024 · 237 followers View post →
John
@johnawahba · X

@jessald To me, doesn't pass occam's razor. There's a pretty recognizable correlation between population density and fertility. https://t.co/LZiU1H2TYE We see the same thing in non-human animals as well. Do you think the rats secretly know the singularity is coming? :P

Nov 4, 2024 · 636 followers View post →
Darlene Clarke
@darleneclarke5 · X

RT @cravecreative: @liberal_party HOW TO KILL A COUNTRY Mass immigration = densification & population reduction:"cramped quarters unsuited…

Oct 24, 2024 · 3 shares · 1,625 followers View post →
Kyle Tober
@KyleTober · X

RT @cravecreative: @liberal_party HOW TO KILL A COUNTRY Mass immigration = densification & population reduction:"cramped quarters unsuited…

Oct 24, 2024 · 3 shares · 1,337 followers View post →
Nicky P
@cravecreative · X

RT @cravecreative: @liberal_party HOW TO KILL A COUNTRY Mass immigration = densification & population reduction:"cramped quarters unsuited…

Oct 24, 2024 · 3 shares · 21,998 followers View post →
Nicky P
@cravecreative · X

@liberal_party HOW TO KILL A COUNTRY Mass immigration = densification & population reduction:"cramped quarters unsuited for raising children" https://t.co/M0AliX7Q1k Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation. https://t.co/gEnAcdJRBT

Oct 24, 2024 · 3 likes · 3 shares · 21,998 followers View post →
Vaviati
@vaviati · X

@HollowSolace @NotPotBol Because it does. https://t.co/jjxu0o5GKD

Oct 18, 2024 · 1 like · 43 followers View post →
Ben. Q.
@B_______Q_____ · X

@RokoMijic I don't know precisely but it's a very well supported finding (e.g. https://t.co/8LCNjyHD4g & many others) My best guess is that ambitious drives to subdue the earth's resources are coupled with the drive to reproduce (Genesis 1:28) & as exploitation maxes out fertility falls.1/2

Oct 15, 2024 · 164 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@GCarty80 @spaceliberal @yhdistyminen Family formation than high-density urban cores. The data absolutely bears that out, in terms of multiple factors: - actual birth rates ( see here: https://t.co/LP6b1h7RNK ) - outdoor play for kids - local greenspace availability - happiness https://t.co/vfqhSzYIEw

Sep 12, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@cyb3rraga @RM_Transit @carastern @TroyMclure22 Majority of Toronto kids in apartments... that is indeed recent.. I believe that only became the case in 2023. 1/1. Density goes with fewer kids: studied across 174 countries, robustly confirmed, both within countries and between countries. https://t.co/LP6b1h8pDi 2/2.

Aug 30, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@RM_Transit @carastern @TroyMclure22 Here's a study of 174 countries that robustly concluded both within country and between country that density was related to lower fertility rates: https://t.co/LP6b1h7RNK

Aug 29, 2024 · 237 followers View post →
Justin j
@JetboyMT · X

@TribTowerViews @clunky343_ @aarmlovi You have access to Google or another ? https://t.co/5GhR5O1FJ1

Aug 22, 2024 · 81 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@cosmonautics_ @TheAgenda @C_AnthonyMilton 1/x: 174 nation study. Densification robustly correlated with lower fertility. Both between countries, and within countries. https://t.co/LP6b1h7RNK

Aug 16, 2024 · 237 followers View post →
Phillip.png ⚡
@pmsyyz · X

@kaseyklimes https://t.co/mwxzkajKGN

Jul 30, 2024 · 1 like · 1,152 followers View post →
Chichicov
@Chichicov2002 · X

@kitten_beloved I will bet that yes, higher density depresses fertility: 1. https://t.co/0JGaTaxKvq 2. https://t.co/BLfPtbGzAc

Jul 28, 2024 · 1 like · 94 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@StatisticUrban Densification is robustly correlated with lower fertility. https://t.co/LP6b1h7RNK

Jun 22, 2024 · 237 followers View post →
Anton
@caliburn13 · X

@mrKPbIS @Oleshkevich @vlsurin Демографический переход - это уменьшение положительного влияние на рождаемость факторов как убийства, болезней, религиозность и жестких социальных норм. Когда эти факторы сильно слабеют, важнее всего становится плотность населения https://t.co/COzPbzGzRv. https://t.co/kvYmGgjfFR

Jun 16, 2024 · 550 followers View post →
donnareiterppc
@donnareiter15 · X

RT @cravecreative: 2/ What is densification's END goal? Bio-Surveilance? Digital Tracking? Global Food Banks? Personal Carbon Tracking? Po…

May 30, 2024 · 3 shares · 3,890 followers View post →
KarBel - God Bless Humanity!
@KarenBe39842082 · X

RT @cravecreative: 2/ What is densification's END goal? Bio-Surveilance? Digital Tracking? Global Food Banks? Personal Carbon Tracking? Po…

May 30, 2024 · 3 shares · 3,787 followers View post →
Stan Edward - Truth Seeker!
@StanEdward7 · X

RT @cravecreative: 2/ What is densification's END goal? Bio-Surveilance? Digital Tracking? Global Food Banks? Personal Carbon Tracking? Po…

May 29, 2024 · 3 shares · 1,938 followers View post →
Nicky P
@cravecreative · X

2/ What is densification's END goal? Bio-Surveilance? Digital Tracking? Global Food Banks? Personal Carbon Tracking? Population Reduction? Indeed. "Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation." https://t.co/gEnAcdKprr

May 29, 2024 · 9 likes · 3 shares · 21,998 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@ray_hoang30 @michael_wiebe Yes, I'm sure. Socioeconomic variables controlled for. Link to the study: https://t.co/LP6b1h8pDi https://t.co/RYmI1kScvj

May 29, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@whitherdrift @BradMBradford Which is its own race to the bottom. Our kids spend more time on screens, which is increasingly being tied to deteriorating mental health. Nevermind that we're well short of replacement level birth rates, thus making our societies unsustainable https://t.co/LP6b1h7RNK

May 26, 2024 · 237 followers View post →
Caleb
@cawheeler · X

@ArmandDoma I didn’t make a causal argument. But I do think environment can influence choices. We know that as density increases, birth rates fall. https://t.co/hGiUAv6bk1.

May 21, 2024 · 48 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@NZ_Reece @cristianyimby @Yimbymanatee @brendanwhitsitt @ineastyork Birth rates are robustly tied to density. High density means insufficient birth rates. 174 country study, compared both within countries and between countries. Reduced setbacks means higher density means lower birth rates. https://t.co/LP6b1h7RNK Call me a ghoul all you want

May 18, 2024 · 1 like · 237 followers View post →
Fatih Pax Turca Türk İhtilali 1283
@hus_ruva · X

"Artan nüfus yoğunlukları, zaman içinde azalan doğurganlık oranlarını öngörüyor: 174 ülkelik bir araştırma" Rotella ve ark ., 2021 https://t.co/tKFNvu8WxA

May 18, 2024 · 2 likes · 1,772 followers View post →
William Gibbons
@wxgibbons · X

@Samfr Think this is a bit disingenuous. Fertility rates are linked to population density (which rises with immigration). South Korea has high population density because of high fertility rates (>4) in the 50s, 60s & 70s. It’s a special case. https://t.co/oGcz8v41Sw

May 16, 2024 · 22 followers View post →
William Gibbons
@wxgibbons · X

@Samfr @SAshworthHayes What's most relevant is probably the link with population density. https://t.co/oGcz8v41Sw

May 15, 2024 · 22 followers View post →
fuelgrannie
@fuelgrannie · X

RT @MZAF25: @pinkskywriting @fuelgrannie The data says otherwise: https://t.co/LP6b1h7RNK

May 6, 2024 · 1 share · 5,793 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@pinkskywriting @fuelgrannie The data says otherwise: https://t.co/LP6b1h7RNK

May 6, 2024 · 1 like · 1 share · 237 followers View post →
OstMan
@kalleostman · X

RT @Helot_: @MoreBirths @bryan_caplan There is a strong negative correlation between population density and apartments and fertility rates.…

May 4, 2024 · 1 share · 452 followers View post →
Helot
@Helot_ · X

@SolarxPvP @MoreBirths @bryan_caplan It is not irrelevant. Population density itself is strongly correlated with fertility. This is a 171 country study. It's not that we are doing it wrong, it is bad in and of itself. https://t.co/ycx2JblVxk

May 4, 2024 · 1,864 followers View post →
Helot
@Helot_ · X

@MoreBirths @bryan_caplan There is a strong negative correlation between population density and apartments and fertility rates. We should be looking to spread people out, not densify. https://t.co/ycx2JblVxk https://t.co/P2GdW1qGXK

May 4, 2024 · 2 likes · 1 share · 1,864 followers View post →
100 Qin Shihuangdi
@QinShihuangdi44 · X

@MoreBirths @bryan_caplan https://t.co/Y02hbTkoa0 The paper "Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation" finds that changes in population density account for 31% of the variance in fertility. https://t.co/gbPoZJGoGP

May 4, 2024 · 40 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@globeandmail A quick thread

Apr 19, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@KishoneRoy @globeandmail One of the core proposals of the housing plan is "fourplexes by right", and densification along corridors. Densification is robustly correlated with lower fertility (174 nation study; considers both within and between countries): https://t.co/LP6b1h7RNK

Apr 19, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@MoreHomesHRM This is not at all nonsense. Density is robustly correlated w lower fertility, according to a 174-nation study. It controls for a variety of variables, and considers both within- and between-countries. https://t.co/LP6b1h7RNK

Apr 19, 2024 · 237 followers View post →
Helot
@Helot_ · X

It would be terrible actually. Population density has a strong negative correlation with fertility rates. Fertility rates that are already in free fall around the world, especially the developed world. https://t.co/ycx2JbmtmS https://t.co/SlM8SCJofR

Apr 18, 2024 · 4 likes · 1,864 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@ColinDMello Canada already doesn't nearly have enough kids. Densification is robustly correlated with fewer kids. https://t.co/LP6b1h7RNK Opposition to 4plexes everywhere is good.

Apr 3, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@SyntheticusAlt Mass densification means less kids. We already don't have enough kids. https://t.co/LP6b1h7RNK

Apr 3, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@krubner @lymanstoneky @PTBwrites Density is robustly correlated with lower fertility. So completely makes sense that upzoning leads to reduced fertility. https://t.co/LP6b1h7RNK

Apr 3, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@cyb3rraga @EricDLombardi Back up for my 2nd point: - robust correlation between higher density and lower fertility across 174 nations: https://t.co/j19bQTG9IL. - and on my second sub point: - AUS study found that over 50% of play happens at home. Way easier to play if your home has a yard

Jan 27, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@Zack12231298 Density is robustly correlated with lower fertility rate. 174 nation study. Controlled for a variety of variables. My goal is quality of life. Density/urbanism has some elements that improve quality of life, and other elements that reduce it. https://t.co/LP6b1h7RNK

Jan 23, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@SyntheticusAlt Density means: 1) lower birth rates (which means you need to jack immigration back up) https://t.co/LP6b1h7RNK 2) reduced happiness https://t.co/qKG8729qLm. 3) less local greenspace 4) higher inequality 5) higher land prices 6) less likely kids have yards to play in

Jan 14, 2024 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@TheSpiralPro @TheJasonJBailey @SyntheticusAlt 174 nation study. Highly robust finding. Controlled for numerous factors. https://t.co/LP6b1h7RNK

Jan 14, 2024 · 1 like · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@beheshtialex And, regardless of what your friends did... "increases in population density are associated with declines in fertility rates, controlling for a variety of socioeconomic, socioecological, geographic, population-based, and female empowerment variables." https://t.co/LP6b1h7RNK

Jan 14, 2024 · 237 followers View post →
John
@thejohnpaulhyde · X

We need more children. Ultra-density has a negative effect on the creation of families. This isn’t a side-effect of yimbyism that should be ignored. https://t.co/NuQgMyHQVd

Jan 10, 2024 · 1 like · 1,688 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@gabedsouza13 @pothen @GraChurch @MoreNeighbours 174 nation study. Controls for female empowerment variables. https://t.co/j19bQTG9IL.

Jan 6, 2024 · 237 followers View post →
Wolfgang Blackwood
@postmindfuck · X

@Rainmaker1973 Increased population density reduces fertility. https://t.co/xSXyxdxFB7

Dec 28, 2023 · 4 likes · 572 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@mldunham @MikePMoffatt Basically every major Asian country is far below replacement level birth rates. They're on the brink of collapse. Density is correlated with lower birth rates. Consistent finding across 174 nations. https://t.co/LP6b1h7RNK

Dec 16, 2023 · 237 followers View post →
Ackermann
@Ackermann_cz · X

V nejméně westernizovaných státech je pozitivní korelace mezi hustotou zalidnění a porodností. Nejspíše protože jejich města nejsou liberálním centrem? https://t.co/LDa3evjXim https://t.co/EzNzzrDMX7

Dec 8, 2023 · 3 likes · 746 followers View post →
United Koreas
@United_Koreas · X

@Kanthan2030 We have too many people. "We find a robust association between density and fertility over time. That is, increases in population density are associated with declines in fertility rates, controlling for a variety of variables." https://t.co/qwxQ4SbuTz

Dec 5, 2023 · 1,034 followers View post →
United Koreas
@United_Koreas · X

It was just brought to my attention that many folks are unaware of the relationship of population density and birth rates. Demographics: "increases in population density are associated with declines in fertility rates" https://t.co/qwxQ4SbuTz

Dec 4, 2023 · 1,034 followers View post →
United Koreas
@United_Koreas · X

@TheHankyoreh It was just brought to my attention that many folks are unaware of the relationship of population density and birth rates. Demographics: "increases in population density are associated with declines in fertility rates" https://t.co/qwxQ4SbuTz

Dec 4, 2023 · 1,034 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@RyanMatCampbell @MayorOliviaChow Birth rates. They decline with density. 174 nation study. We already don't have enough kids. https://t.co/LP6b1h7RNK 3/x

Nov 19, 2023 · 237 followers View post →
Wyvernsrose #RaiseTheRate
@wyvernsrose · X

RT @AndOily: @OurNewHomecoach Interesting research on the effect of density on fertility https://t.co/KdkyMmDrXx.

Nov 9, 2023 · 1 share · 2,065 followers View post →
Oily And Tick Consultants
@AndOily · X

@OurNewHomecoach Interesting research on the effect of density on fertility https://t.co/KdkyMmDrXx.

Nov 8, 2023 · 1 like · 1 share · 668 followers View post →
James' dog.
@WestminsterPup · X

Of course you can do this *and* permit densification in inner cities, but families will always choose leafy suburbs. There's also good evidence people are more likely to want to start a family when they're in a low density environment. https://t.co/tWbSsMAJwm

Nov 1, 2023 · 3 likes · 4,858 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@beheshtialex "We find a robust association between density and fertility over time, both within- and between-countries. That is, increases in population density are associated with declines in fertility rates, controlling for a variety of ... variables" https://t.co/j19bQTG9IL.

Sep 18, 2023 · 237 followers View post →
Matt Zaffino CPA, CA
@MZAF25 · X

@MikePMoffatt 7) Less kids generally... High density predicts fewer kids (bigger mortgages/rental pmts means less $ to feed more mouths). Many countries are facing severe issues w below replacement level birth rates: social services collapse w declining tax base https://t.co/LP6b1h7RNK 8/8

Aug 29, 2023 · 237 followers View post →
Anastasia
@demystifysci · X

@robinhanson @MaxCRoser It's a question of the effect of density on reproduction, which is a common feature of animal populations. Seems to hold in humans, too, which suggests that there's a feedback loop that has nothing to do with tech: https://t.co/BVctvVEeRz

Aug 5, 2023 · 5 likes · 4,357 followers View post →
Veight
@Veight12 · X

@JoeGibb69377091 @ScottAdamsSays I think you're on to something: https://t.co/Cqx5wGFxCp

Jun 22, 2023 · 1 like · 59 followers View post →
TasteyFlav
@TasteyFlav · X

@JasnTru {Already has astronaut} https://t.co/MZggt8e3a7

Mar 7, 2023 · 1 like · 1,910 followers View post →
Suze
@STSue63 · X

@DVATW When a population starts to reach high density birth rates fall. There are too many humans on the planet. https://t.co/IoAK3Ho8T8

Feb 13, 2023 · 9 likes · 229 followers View post →
Lance atman
@LanceHirdler13 · X

This is my hypothesis on decreased in fertility is due to population density https://t.co/go33H0baJ0

Dec 24, 2022 · 1,186 followers View post →
EHBEA 2022 - Online Conference
@ehbea2022 · X

RT @j2bryson: Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation @amrotella https://t…

Apr 20, 2022 · 3 shares · 460 followers View post →
Amanda Rotella
@AMRotella · X

RT @j2bryson: Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation @amrotella https://t…

Apr 20, 2022 · 3 shares · 823 followers View post →
Julien Burcher
@Dowellenough · X

RT @j2bryson: Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation @amrotella https://t…

Apr 20, 2022 · 3 shares · 1,846 followers View post →
Joanna J Bryson
@j2bryson · X

Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation @amrotella https://t.co/nYt6f1vdLg Populations tend to reduce as housing density increases, IF infant mortality stays low 1/2 #ehbea2022 #demographicTransition

Apr 20, 2022 · 4 likes · 3 shares · 28,667 followers View post →
Michael Hogan
@michaelhogannui · X

Increasing #population #densities predict decreasing #fertility rates over time: A 174-nation investigation. https://t.co/faD0NNSC8D

Dec 17, 2021 · 3,504 followers View post →
localhostscience
@localhostsci · X

Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation

Oct 17, 2021 · 34 followers View post →
Giulio Magnifico
@giuliomagnifico · X

Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation. via /r/science https://t.co/RIJ93BKVLk

Oct 17, 2021 · 263 followers View post →
KU Research
@kueprints · X

Kingston University: Increasing population densities predict decreasing fertility rates over time : a 174-nation in - https://t.co/M6VeDpc57i

Jun 10, 2021 · 562 followers View post →
Bipartisan Alliance
@jorgemata · X

Increasing Population Densities Predict Decreasing Fertility Rates over Time: A 174-nation Investigation https://t.co/AJbeNbgnha

May 29, 2021 · 188 followers View post →
Sherwin Hunley
@Hunley77 · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 24, 2021 · 25 shares · 227 followers View post →
No Stopping the Ride
@shangrila500 · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 14, 2021 · 25 shares · 895 followers View post →
Lil uzi bert
@RobsGotNoLand · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 14, 2021 · 25 shares · 243 followers View post →
Abm
@abm1247 · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 165 followers View post →
James du Plessis
@JamesXDuPlessis · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 66 followers View post →
Earth Is A Sales Funnel For SATAN
@GENIC0N · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 28,667 followers View post →
Isegoria
@Isegoria · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 1,640 followers View post →
βόρειος βαρόνος
@BorealBaron · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 35,556 followers View post →
Too Much Sense
@TooMuchSense5 · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 4 followers View post →
Pseudo_Amphiaraus
@P3rs3vs · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 1,188 followers View post →
Adam Perkins
@AdamPerkinsPhD · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 3,558 followers View post →
Prisme
@PrismeBleu · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 582 followers View post →
Holtz
@Biorealism · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 8,911 followers View post →
ɹʞɔɟɯ
@mfckr_ · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 1,116 followers View post →
Henry Avery
@PIErateUrheimat · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 27 followers View post →
Richard Harper
@harpersnotes · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 9, 2021 · 25 shares · 2,235 followers View post →
Eric Orcadian
@EricOrcadian · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 8, 2021 · 25 shares · 1,173 followers View post →
DTS
@realcanuck7 · X

RT @KirkegaardEmil: Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. O…

Jan 8, 2021 · 25 shares · 728 followers View post →
Emil Kirkegaard
@KirkegaardEmil · X

Cities bad. Population density seems to increase work productivity by nonlinear scaling BUT at the cost of fertility. Optimize enough and you die out Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation https://t.co/uZoN6TTFun

Jan 8, 2021 · 93 likes · 25 shares · 45,406 followers View post →
Amanda Rotella
@AMRotella · X

RT @PsychoSchmitt: "Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation" https://t.co/…

Aug 17, 2020 · 2 shares · 823 followers View post →
φP
@VirialExpansion · X

RT @PsychoSchmitt: "Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation" https://t.co/…

Aug 10, 2020 · 2 shares · 288 followers View post →
David Schmitt
@PsychoSchmitt · X

"Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation" https://t.co/IG5qtawAL7 https://t.co/OLjAd53fV6

Aug 10, 2020 · 6 likes · 2 shares · 12,461 followers View post →
Bipartisan Alliance
@jorgemata · X

Increasing Population Densities Predict Decreasing Fertility Rates over Time: A 174-nation Investigation https://t.co/APhEC1Zcrz

Aug 7, 2020 · 188 followers View post →
PsyArXiv-bot
@PsyArXivBot · X

Increasing population densities predict decreasing fertility rates over time: A 174-nation investigation https://t.co/Pv5xqbaSa8

Aug 6, 2020 · 7,270 followers View post →