How does a firm use the marginal revenue product (MRP) to determine the number of workers to hire?

• A. A firm hires workers until the MRP is zero.
• B. A firm hires workers until the MRP exceeds the wage rate.
• C. A firm hires workers up to the point where the MRP equals the wage rate.
• D. A firm hires workers based on the average revenue product.

Answer: (C)