A decades-long decline in the U.S. fertility rate has confounded policymakers and economists alike, with experts pointing to possible causes ranging from the economic fallout of the Great Recession to changing public attitudes about parenthood. Now, one economist is pointing to another factor: the iPhone. A new research paper by Middlebury College economist Caitlin Myers found that Apple’s 2007 introduction of the iPhone accounted for 33% to 52% of the decline in the fertility rate. The reasons are rooted in the enormous social impact of putting a powerful new device in people’s pockets that not only tethered them to the internet but also rewired how we relate to each other — or whether we choose to relate at all. Specifically, Myers posits that many people have turned to their phones as a substitute for