Answer: Efficiency wage theory
Explanation:
The efficiency wage theory is refers to the labor economics that argues about the wages fir the labor or workers in the market.
The main aim of the efficient wage theory is that it helps in increase the efficiency and the labor productivity by reducing the cost of the turnover in industries.
This theory is mainly developed by the Alfred Marshall as they denote the wages per unit labor efficiency. Therefore, the efficiency wage theory is the correct answer.