Are Google and Facebook the new monopolies?

The problem of monopolies is moving back to the forefront of American politics, as mega-mergers like AT&T and Time Warner or Charter and Time Warner Cable are weathering shouts of outrage from everyone from Sen. Elizabeth Warren (D-Mass.) to President-elect Donald Trump. But perhaps the biggest monopolies we should be worried about are two Silicon Valley giants: Google and Facebook. Monopolies are generally thought to be bad because they jack up prices and screw consumers. And that's not wrong. ...