15. Which of the following theories is associated with the piece-rate system? A. The two-factor theory B. The theory of the hierarchy of needs C. The theory of the Hawthorne effect D. Theory X and Theory Y E. The classical theory of motivation 16. Vixen works in a soap manufacturing company. He is paid a fixed amount for every unit he manufactures at the factory. He is paid higher rates for exceeding his set target. The payment system in this scenario is an example of the: A. barter system. B. piece-rate system. C. bonus system. D. over-time system. E. hourly-payment system. 17. The person primarily associated with the Hawthorne Studies is A. Abraham Maslow B. Douglas McGregor C. B.F. Skinner D. Nathaniel Hawthorne E. Elton Mayo 18. Which of the following is labeled the Hawthorne effect? A. Decrease in productivity as work hours increased B. Increase in productivity regardless of physical conditions C. Decrease in productivity regardless of supervision D. Increase in productivity as pay increased E. Productivity remaining the same despite increase in efficiency