Monopolies — or companies accused of monopolistic behavior — in the U.S. have been around for more than a century.

These days, the focus has been on tech leaders and/or Silicon Valley companies like Google, Facebook and Amazon.

But megamergers in other industries haven’t been immune from concerns of regulators and the public.

But how common are monopolies really? And are government watchdogs able to limit them?

With me to talk about those and other questions is Brian O’Roark, economics professor at Robert Morris University.