In one company, associates sell a consumer product over the telephone. At unpredictable times throughout the day, associates receive $20 cash bonuses for sales. Some associates might receive a bonus at 11 A. M., 1:30 P. M., 2 P. M., and
then at 5 P. M. Other employees might receive the bonus at 9:30 A. M., 11:15 A. M., 3:30 P. M., and 4:15 P. M. The bonus is
delivered on a reinforcement schedule.