Warning Signs That a Bubble Is About to Burst

You don’t need a Nobel to see the similarities between 1999 and 2019

Credit: Johannes Eisele/Getty Images

InIn 1999, I and a gaggle of other San Francisco internet founders and CEOs went to an airfield, where we browsed private jets. It made sense that, at 34, I should have a one-bedroom apartment to transport me across the surface of the atmosphere at mach .8, because I was a…