All of these are clinical scales on the MMPI EXCEPT which one?

The one and only reason Julius works as a waiter is because the tip money is outstanding. Julius's desire to gain this external reward as a primary reason for working illustrates the notion of _____

Fill in the blank with correct word

Juan used to be a fairly generous individual, but it seemed that whenever he loaned things to people, they were never returned, or they were returned broken. Consequently, Juan is no longer generous. Based on principles of operant conditioning, Juan's lack of generosity is MOST likely a result of

a. punishment. b. positive reinforcement. c. negative reinforcement. d. extinction.