Answer:
The theory of efficiency wages why might some firms voluntarily pay workers a wage above the market equilibrium, even in the presence of surplus labor is due to these reasons:
Paying higher wages enhances workers to adopt healthier lifestyles, enhancing their productivity.
Paying higher wages can reduce a firm's training costs.
Paying higher wages encourages workers to be more productive.
Explanation:
Payment of higher wages increases the efficiency and productivity of the workers.
Also, payment of higher wages gives room for self-motivation among workers. Therefore, much training is not required leading to a reduction in training cost.