WASHINGTON — Baby bonuses, expanded childcare tax credits, paid parental leave mandates: the policy arsenal that governments from Seoul to Budapest to Washington have assembled to reverse falling birth rates has one thing in common. None of it addresses what two economists now say is the dominant driver of the collapse — the device sitting in every young person’s pocket.
A working paper published Monday by the National Bureau of Economic Research makes a provocative case that the iPhone, introduced by Apple in June 2007, is responsible for between 33 and 52 percent of the decline in the U.S. general fertility rate since that year. The study, authored by Caitlin K. Myers of Middlebury College and her former undergraduate student Ezekiel Hooper, uses a methodological twist that most fertility research lacks: a genuine natural experiment.
When Apple launched the iPhone, it sold exclusively through AT&T. That arrangement held until February 2011, creating an inadvertent geographic divide — counties with strong AT&T mobile broadband coverage got the smartphone era four years before counties without it. Myers and Hooper compared fertility outcomes across that divide and found the gap was not random. Births fell measurably faster where the iPhone worked. The effect was absent in counties that relied on Verizon or Sprint, carriers that had no iPhone access during those same years. It is the kind of placebo check that makes skeptics quiet down.
The numbers are jarring in their specificity. The paper estimates that iPhone access reduced births by 4.5 to 8 percent among women aged 15 to 19, and 3.2 to 6.6 percent among those aged 20 to 24. Statistically significant but smaller effects appeared among older age groups. When aggregated across the reproductive-age population, Myers and Hooper’s models attribute roughly half the total 22 percent decline in the U.S. fertility rate to smartphone diffusion alone.
What the study does not do — and what Myers is careful to acknowledge — is explain precisely why. The data from national surveys points toward three mechanisms that are not mutually exclusive. Smartphones appear to have substituted for in-person social interaction, reducing the unstructured contact in which most unintended conceptions among young people occur. They have enabled easy, constant access to pornography, which national time-use surveys show has displaced partnered sexual activity. And they have contributed to the documented rise in loneliness, anxiety, and depression among young adults, conditions not typically conducive to forming the kinds of relationships that result in children.
The implications for policymakers are uncomfortable. Baby bonuses and childcare subsidies operate on the premise that people who want children are being prevented by economic friction. Remove the friction, the logic goes, and the births follow. That framework may have been adequate when the primary obstacle to fertility was financial. It struggles to account for a generation that has reorganized its social life around a screen.
“People just aren’t forming the relationships that result in children,” Myers told Axios. The iPhone, she is careful to say, is not a contraceptive device in any mechanical sense. Phillip B. Levine, an economist at Wellesley College who studies fertility, described it as an illustration of the broader social influences driving the birth rate down — a distinction that matters enormously for anyone trying to design a policy response. Baby bonuses cannot fix social isolation. Tax credits do not make a 23-year-old go out and meet someone.
The NBER study lands alongside a second paper, published in May by Nathan Hudson and Hernan Moscoso-Boedo at the University of Cincinnati, that widened the aperture to a global dataset. Their study, titled “The Collapse of Teen Fertility in the Digital Era,” found that teen fertility declined simultaneously and substantially across countries at very different income levels, with very different contraceptive access regimes, and under very different welfare and housing policy frameworks. The only variable that predicted the timing and magnitude of the collapse across all of them was the spread of digital technology. Once enough teenagers migrated their social lives onto their phones, the researchers found, in-person contact fell sharply — and with it, the unstructured physical proximity in which most unintended teen conceptions occur.
That framing — the phone as peer-network organizer, in-person socialization as the casualty — has an uncomfortable corollary that neither study addresses directly. The same mechanism that the University of Cincinnati researchers say suppressed teen fertility also, in their modeling, produced the concurrent rise in teen suicide. The two trends share a cause and a timeline. This is not a narrowly economic problem.
Apple’s broader trajectory in 2026 is, if anything, accelerating the conditions the NBER study describes. The company is preparing a foldable iPhone that industry observers expect to deepen smartphone adoption across age groups, adding yet another form factor to the devices that, by Myers and Hooper’s account, have already reshaped the most intimate aspects of young people’s lives.
Critics of the smartphone hypothesis have not disappeared. Reason reported in May that fertility rates have been falling for centuries, long before any iPhone existed, and argued that the counties receiving early AT&T coverage were systematically different — more urban, more culturally liberal, populated by young professionals with different family-formation timelines — in ways that could independently explain faster fertility decline. Myers and Hooper acknowledge in their paper that they cannot entirely rule out such confounding; the placebo analyses reduce its plausibility but do not eliminate it.
What the study cannot resolve, and what its authors do not pretend to resolve, is the most important policy question: what, if anything, can governments actually do about it. Screen-time restrictions for minors have been proposed and enacted in various forms. Phone bans in schools are spreading across Europe and parts of the United States. Whether such interventions translate into more in-person socializing, fewer missed connections, and ultimately more children is, at this point, entirely uncharted empirical territory.
“I don’t really see that happening,” Myers said, when asked whether the solution might be encouraging people to put down their phones. “Regardless of what one economist in Vermont thinks about it.”
She is almost certainly right. What the research does, at a minimum, is expose the limits of the current pronatalist toolkit. The countries that have thrown the most money at the problem — Hungary, South Korea, Japan — have seen marginal or negligible effects on fertility from cash transfers and subsidies. Those programs were designed to solve a different problem. The iPhone study suggests the problem is harder, stranger, and more deeply embedded in the architecture of modern social life than any government spending program is equipped to address. Whether that changes what policymakers actually do is another question entirely.
