The timing has long raised questions. Birth rates in the US and dozens of other countries started falling in 2007 — the same year Apple put the first iPhone on sale. Two recent academic papers, highlighted by The New York Times, now argue that the overlap is no accident.
What the studies found
Economist Caitlin Myers and her student Ezekiel Hooper from Middlebury College built their case around a structural quirk: the original iPhone only worked on AT&T’s network. That gave them a natural experiment. Counties with strong AT&T coverage got early smartphone access, while counties without it largely didn’t.
Comparing fertility data across these two groups, the researchers concluded that iPhone access drove as much as half of the US birth rate decline between 2007 and 2011, with the strongest effect in the 15-to-24 age group. The researchers suggest a shift away from in-person socializing, increased access to pornography, and greater awareness of contraception and abortion options as possible explanations.
A separate study took an even broader view. Hernan Moscoso Boedo (University of Cincinnati) and Nathan Hudson examined World Bank data across 128 countries and found that teenage fertility rates fell sharply once smartphones became mainstream — regardless of differences in healthcare systems, religion, or economic conditions. In the US, counties with faster broadband and 4G coverage saw steeper declines in teen birth rates.
A contested conclusion
The research hasn’t settled the debate. Baruch College economist Theodore Joyce points out that teen birth rates were already falling before 2007 and says the smartphone hypothesis, while plausible, remains unproven.
The studies arrive as governments in the US, Europe, and East Asia grapple with the long-term economic consequences of shrinking populations. If smartphones are a primary driver, that complicates any policy response. Unlike recessions or housing costs, screen time isn’t something lawmakers can easily legislate away.
