A study estimates the iPhone's diffusion explains 33%-52% of the decline in US births from 2007 to 2011, with the most pronounced effects among women aged 15-24
Modern smartphones rolled out in 2007, the year that fertility rates began falling. Two studies say that is not a coincidence.
New York TimesSabrina Tavernise
Context & Ripple Effects
This study extends related coverage arguing that mass smartphone and social-media adoption may be linked to falling birthrates globally, partly through less in-person socializing. It supplies a narrower US estimate and identifies women aged 15-24 as the group with the strongest measured association.
The finding arrives after the iPhone had become a mature, widely held device rather than a growth-only product, shifting attention from handset sales and market share to the social consequences of pervasive smartphone access.
First-order effects
The study gives the iPhone’s 2007-11 diffusion a quantified place in the US fertility-decline debate, while concentrating immediate attention on outcomes for women aged 15-24.
Apple and the broader smartphone sector face more scrutiny over how device adoption may alter social behavior; the reported estimate is an attribution from a study, not proof that phones alone caused the decline.
Second-order effects
The result strengthens the case for researchers and policymakers to examine smartphones together with social media and changes in in-person socializing, rather than treating fertility trends as solely economic or cultural.
Competing device and platform companies are implicated by the related coverage’s wider smartphone-and-social-media framing: the issue is not confined to one handset brand even though the study uses iPhone diffusion as its measure.
Third-order effects
If further work reproduces these findings across markets and platforms, demographic outcomes could become part of the long-term accountability debate around consumer technology design and youth use.
The larger implication is a shift in how mature smartphone markets are evaluated: not only by adoption and replacement cycles, but also by persistent effects on offline relationships and life-course decisions.
The trend: This is one data point in a broader reassessment of ubiquitous smartphones and social platforms as potential forces reshaping offline social behavior and demographic patterns.
The iPhone as Birth Control? This clever new NBER paper exploits the 2007 to 2011 window when the iPhone was serviced only by AT&T as a natural experiment. It found that smartphones explained a third to half of the U.S. fertility decline among women age 15 to 44, impacting teen […
remember how Sama said social feeds are the first misaligned AI this is basically confirmed. social feeds are causing mass extinction not through an elaborate yudkowskian p_doom fantasy but by eliminating the natural urge to procreate. ( https://blog.samaltman.com/...) [image]
More placebos: we fake the iPhone's launch in earlier years, and swap in Sprint and Verizon's footprints. All null. Verizon-but-not-AT&T counties show no effect. [image]
Our natural experiment: when the iPhone launched in 2007, Apple gave AT&T the exclusive right to sell it. That monopoly lasted nearly four years, until 2011.But AT&T didn't have coverage everywhere. Using validated SBI broadband data, we map AT&T coverage county by county. [image…
We then map AT&T coverage to changes in births. Births to young people fell far more where AT&T—and the iPhone—reached. For older women, births rose less. [image]
It's (at least partly) the phones, y'all. New NBER WP this morning with Zeke Hooper: we estimate the diffusion of the iPhone explains 33-52% of the decline in US births from 2007-2011. #econtwitter🧵 https://www.nber.org/...
Earlier this year, I was very skeptical of the claim that smartphones reduced birthrates, because fertility declined so, so long before the arrival of smartphones. But @JesusFerna7026 changed my mind, and studies like this have confirmed that my mind should stay changed. The
The “diffusion of the iPhone deepened the decline in births among women under 30 while suppressing the rise in births among older women...the diffusion of the iPhone explains 33-52% of the decline in the general fertility rate among women aged 15-44.” https://www.nber.org/... [im…
Is it the phones? A new paper uses AT&T's 2007-2011 iPhone monopoly as a natural experiment and finds that iPhone access sharply reduced births, especially among younger women. Smartphones may explain 33-52% of the post-2007 decline in U.S. fertility. [image]
To be clear, the magnitude doesn't seem plausible given that the time examined was the weakest iPhone environment and social media environment. But any effect at all is interesting.
At this point while I still think these cellphones caused the birth rate drop is about an unobserved variable rather than a causal story but I'm not sure at all what the variable is
Sorry in advance, those of us on Team It's the Phones are going to be a little insufferable today “Overall, the diffusion of the iPhone explains 33-52% of the decline in the general fertility rate among women aged 15-44”
The iPhone diffusion explains possibly half of the fertility decline amongst women! I mean, that is quite something, especially taking into account dating apps. https://www.nber.org/...
This too 👀: “survey evidence is consistent with the iPhone reducing in-person interactions, increasing pornography use, and reducing sexual frequency.”
More evidence it's the phones: @Caitlin_K_Myers and Ezekiel Hooper find “the diffusion of the iPhone explains 33-52% of the decline in the general fertility rate among women aged 15-44” since 2007. https://www.nber.org/... [image]
Any social science “finding” that seems wacky probably is. A third to a half of TFR decline in women aged 15-44 has not been caused by smartphones, obviously.
More evidence for smartphone theory of everything on fertility outcomes “Overall, the diffusion of the iPhone explains 33-52% of the decline in the general fertility rate among women aged 15-44”
Huge new finding providing further evidence for the smartphone/technology hypothesis for fertility decline: “Overall, the diffusion of the iPhone explains 33-52% of the decline in the general fertility rate among women aged 15-44.” https://www.nber.org/...
Great to see our work with Nathan Hudson in The New York Times. Sabrina Tavernise describes the link between smartphones and the decline in birthrates. …