Dear Marker Reader, Back in September, Marker Editor-at-Large Steve LeVine identified a new class of startups: Uber, WeWork and Juul, among others, were Daredevil Unicorns, run by “aggressively blithe founders who, fueled by chutzpah, raw conceptual genius, and a promise to shatter paradigms, have dominated the last decade of technological history with eye-popping valuations.” At the time, LeVine — who has been covering business and geopolitics for nearly three decades at places including the...