“American industry is more highly concentrated than at any time since the gilded age. Need a pharmacy? Americans have two main choices. A plane ticket? Four major airlines. They have four choices to buy cell phone service. Soon one company will sell more than a quarter of the quaffs of beer around the world.” So why do we keep approving so many mega-mergers? You might be thinking of lawyers, consultants, and lobbyists. But there’s another group to add to that list. Professors. No one ever went into academia for the money. But that doesn’t mean they didn’t find some when they got there. ProPublica introduces you to the professors who make more than a thousand bucks an hour peddling mega-mergers.