The paper, published by the National Bureau of Economic Research, notes that the fertility rate in the U.S. has fallen by 22 per cent since 2007, when the first iPhone went on sale in the country... Until 2011, the iPhone was only available in the U.S. to subscribers of AT&T, allowing the researchers to compare birth rates in counties with near-universal AT&T coverage to counties with little or none in the four years since the first iPhone’s release. Their findings suggest a striking relationship between iPhone access and declining birth rates... As for why exactly this is, the researchers present...