Preston John, the office manager of Greenleaf Inc. strongly believes that providing positive consequences for a job well done will increase the likelihood of good work performance in the future. He personally sends e-mails to his employees to commend their efforts when they perform well. From this it can be inferred that Preston believes in

positive reinforcement

Explanation:

Positive reinforcement is a psychological behavior. It may be defined as the giving or providing someone with a rewards or a praising somebody when the person performed the desired action or work.

In the context, Preston John believes in the positive reinforcing his employees and personally mailing them and congratulating them for their hard work and achievements. He believes that by doing so, it will increase the likelihood of the good work performance of the employees in the future.

answer; operating revenues;