In the Monday afternoon session of the A3 antitrust trial, the government’s antitrust economics expert Dr. Nicholas Hill began his testimony — which resumes Tuesday, after the court hears from HarperCollins ceo Brian Murray. He walked everyone through the Herfindahl-Hirschman index, the hypothetical monopsonist test, diversion ratios, second-score auction models, GUPPI analysis and more. The […]