In the raging debate over whether big tech and social media companies have gotten too big and too powerful, there's a call for North American regulators to take action. Denise Hearn, co-author of 'The Myth of Capitalism: Monopolies and the Death of Competition,' says the "runaway train" of merger activity is eliminating competition, which is bad for capitalism. She says European regulators are far more protective of free markets than Canada or the U.S.