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Efficiency wages refer to the practice of paying employees a wage higher than the market equilibrium level to enhance their productivity and efficiency. This concept hinges on several key ideas in labor economics.

When firms pay wage levels above the equilibrium, they incentivize employees to work harder and remain loyal to the company because workers are aware that they could face a loss if they leave their current jobs for lower-paying positions. Higher wages can also lead to reduced turnover, decreased absenteeism, and increased morale among employees. This leads to a more motivated workforce, which ideally translates to higher productivity levels for the firm.

Additionally, firms might use efficiency wages to attract better talent, ensuring that they have capable and skilled workers. Since higher wages can reduce the costs associated with hiring and training new employees due to lower turnover rates, paying efficiency wages can ultimately be a cost-effective strategy in the long run.

In contrast, the other options do not encapsulate the idea of efficiency wages. Paying beneath-equilibrium wages would typically not increase productivity; adjusting wages according to consumer prices does not inherently improve worker efficiency, and setting minimum wages by the government is a regulatory action that might not align with the principle of efficiency wages.