Google's search engine runs about two-thirds of all searches in the United States and 90 percent in Europe. "Platform monopolies" like this can squelch innovation. Google could favor its own services, such as Google Maps and Google Shopping, for example.
This is one reason that the European Commission hit Google with a fine of 2.42 billion euros in June.
Why hasn't Google run into similar problems with antitrust authorities in the United States?
It almost did in 2012. The Federal Trade Commission's Bureau of Competition recommended that the FTC sue Google for conduct that "has resulted — and will result — in real harm to consumers and to innovation in...