They use a Straight Piecework Plan as an incentive to their employees.
The Straight Piece-Work System is the simplest incentive approach in which the rate in keeping with unit of output is fixed, and the income of the employee are computed with the aid of multiplying his total output by rate per unit. We can also define this as the system or plan in which the employers or workers are paid according to the number of units produced during a defined time period at fixed rate.