Reference: Ref 17-2 (Table: Sunshine Flower Vase Co.) Refer to the table. What is the marginal product of labor for the fifth worker?

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To calculate the marginal product of labor, we look at the change in total product (output) when one more unit of labor is added. In this case, the total product for 4 workers is 600 units, and the total product for 5 workers is 780 units. The marginal product of labor for the fifth worker is therefore 180 units ($1,800 - $1,620).