Monopsony:A market structure where there is a single buyer (employer) of labor, giving the employer significant market power to set wages and working conditions.
Oligopsony:A market structure where a few large employers dominate the labor market, allowing them to collectively exert market power over wages and working conditions.
Employer Concentration: A measure of the degree of market power held by employers in a specific labor market, often calculated using metrics like the Herfindahl-Hirschman Index (HHI).