“Firms in industries with the greatest increase in concentration enjoyed higher profits. But, as Adam Smith observed, monopolies don’t serve the public good. Rather, monopolies create barriers to entry which discourage the establishment of new firms and innovation.29 Rising industry concentration was associated with higher pay for senior executives, a decline in workers’ bargaining power, and falling investment and R&D. Economists at the National Bureau of Economic Research found that while ‘low interest rates have traditionally been viewed as positive for economic growth … extremely low interest rates may lead to slower growth by increasing market concentration.”