CEA - labour market monopsony (pdf). Quote:
A growing literature has documented several indicators of declining competition in the United States, and economists have begun to explore the links between these trends and rising income inequality (Furman and Orzag 2015). While recent discussions have highlighted rising concentration among producers and monopoly pricing in sellers markets (The Economist 2016), reduced competition can also give employers power to dictate wages — so-called “monopsony” power in the labor market. While monopoly in product markets and monopsony in labor markets can be related and share some common causes, the latter has some distinct causes and policy implications.
This issue brief explains how monopsony, or wage-setting power, in the labor market can reduce wages, employment, and overall welfare, and describes various sources of monopsony power. It then reviews evidence suggesting that firms may have wage-setting power in a broad range of settings and describes several trends in recent decades consistent with a growing role for monopsony power in wage determination. It concludes with a discussion of several policy actions taken by the Obama Administration to help promote labor-market competition and ensure a level playing field for all workers.