Final answer:
Firms may pay wages above market equilibrium due to efficiency wage theory, which posits higher pay increases worker productivity and loyalty, and reduces turnover costs. Even with surplus labor, firms value the stability and motivation of well-compensated employees. Unions also acknowledge that while higher wages are beneficial for workers, they might result in reduced hiring.
Step-by-step explanation:
The concept that some firms voluntarily pay workers a wage above the market equilibrium, even when there is surplus labor, is grounded in efficiency wage theory. This theory suggests that by paying employees more, firms can ensure greater productivity, as employees are motivated to work harder due to the risk of losing their relatively high-paying jobs. Furthermore, paying higher wages may attract a more talented pool of applicants and helps reduce costs associated with training new employees by fostering a stable, committed workforce.
From a union perspective, higher wages result in better worker welfare, although it may reduce the number of employees that firms are willing to hire at these elevated wages. Unions understand that higher wages can result in less hiring, which doesn't necessarily lead to layoffs but can mean a slower rate of replacing workers or expanding the workforce.