The trouble with the U.S. economy is monopoly power.
Concentrated business power means less consumer choice, less opportunity for entrepreneurs and greater concentration of wealth.

Senator Elizabeth Warren
Senator Elizabeth Warren described the problem very well in a speech on Wednesday. If you care about this issue, I strongly recommend that you click on the first link below.
She noted that five banks have been designated as “too big to fail” by the Federal Reserve Board and the Federal Deposit Insurance Corp.
But that situation is not limited to the banking industry. Four airlines (down from nine in the past 10 years) control 80 percent of all airline seats. If American, Delta, United or Southwest were to be in danger of ceasing operations, could there be any doubt that the government would want to keep them flying at all costs?
There’s another problem with concentration in the transportation industry, and that is the incentive to abandon small and remote communities and concentrate services in a few hubs. The second article linked below describes how concentration in the airline, railroad and trucking industries has harmed small cities in the Heartland. “Flyover country” wasn’t always flyover country.
Concentration means less consumer choice. Warren pointed out that more than half of Americans who with Internet or cable television service use Comcast. Yet, she said, a third of U.S. citizens who theoretically have access to high-speed Internet service can’t afford it. Americans pay more than Europeans for Internet service and get worse service.