Firms and production — practice question

The table illustrates the way a firm’s output changes when it hires additional workers. number of workers: 10, 20, 30, 40 total production (kilos): 50, 100, 300, 600 What occurs to productivity as the number of workers employed increases?

• AIt is constant then falls.
• BIt is constant then rises.
• CIt rises then becomes constant.
• DIt rises continuously.