Final answer:
Pam is using positive reinforcement by complimenting Michael to influence his behavior to pick up the phone, demonstrating a concept in social psychology.
Step-by-step explanation:
The scenario described involves Pam using praise, calling Michael the "best boss", to influence his behavior. This illustrates a social psychology concept known as positive reinforcement.
Positive reinforcement occurs when a behavior is encouraged by rewarding it, in this case, with a compliment.
Michael, who previously would let the phone go to voicemail, is now more likely to pick up the phone after receiving praise from Pam.
This situation is a simplification of complex workplace dynamics but serves to show how reinforcement and social interactions can influence behavior in an office setting.