In this graph, the wage (W) is on the axis and the quantity of labor (L) is on the axis.
Suppose that in this labor market, some jobs are restricted to current residents of this city who have lived there for at least one year. Other jobs are open to anyone, regardless of the city of residence.
We would expect the market for jobs for all residents to be depicted on the graph, and jobs for only city residents to be depicted on the graph above.
The equilibrium wage would be in the market that allows city residents only, and the number of workers would be than when both groups were combined.
The equilibrium wage would be in the market that allows all residents, and the number of workers would be than when only residents are included.