A new law requiring plumbers to pass strict certification tests that reduce the number of plumbers would

A) increase the wage rate of plumbers.
B) decrease the wage rate of plumbers.
C) increase the employment of plumbers.
D) cause no change in the labor market for plumbers.

Certification Tests

Examinations that assess an individual's competencies in a particular field, often required to attain professional certification.

Plumbers

Professionals skilled in installing and repairing systems used for water, sewage, and drainage in plumbing systems.

Wage Rate

The compensation received by employees for their labor, typically expressed per hour, day, or unit of productivity.