Final answer:
In the Keynesian efficiency wage diagram of the labor market, real-wage rigidity is depicted by a situation where the nominal wage rate is held above the equilibrium wage level.
Step-by-step explanation:
Real-wage rigidity in the Keynesian efficiency wage diagram of the labor market is depicted by the wage rate being stuck above the equilibrium level, resulting in unemployment. This scenario is represented by figures wherein the quantity of job seekers, denoted as Qs, is greater than the quantity of job openings, denoted as Qd.
Specifically, it is depicted by the bracket showing excess supply of labor, due to wages not falling to the equilibrium level where supply would meet demand.
The concept of sticky wages indicates that wages do not adjust downwards quickly in response to excess labor supply, which leads to persistent unemployment.
When aggregate demand declines, the demand for labor shifts to the left, but wages remain artificially high for a period of time. This wage stickiness prevents the labor market from reaching a new equilibrium and results in a surplus of labor, or unemployment, as indicated in the diagram.