People's trust and belief that the competition in a market is aboveboard spurs economic growth. It's all one big beer bust. But the same systems that seek to drive down prices have the potential for price-fixing. And that means antitrust. I'm always amazed at how useful my history degree is.
American history is all about cracking monopolies.
It was the invention of the legal concept of a trust that spurred antitrust legislation of the 19th and early 20th centuries. The trust is a legal fiction allowing a single board of directors to control the fates of several companies. Digital exchanges do with technology what John D. Rockefeller of Standard Oil and his attorney Samuel Dodd did with the law. Perhaps, but that really isn't the point. The point is that Americans distrust those who wield great power.