Breakthrough cost-efficiency claims from the made-in-China model stunned investors expecting a spending splurge, eroding $600 bln of chipmaker Nvidia’s value. In this week’s Viewsroom podcast, Breakingviews columnists debate what the advance means for machine-learning hype. Visit the Thomson Reuters Privacy Statement for information on our privacy and data protection practices. You may also visit megaphone.fm/adchoices to opt-out of targeted advertising.