ABSTRACT
Recall “Erin’s points program” described at the beginning of Chapter 5. Erin wanted to be nicer to her friends. To motivate herself to do so, she carried an index card and a pen with her and gave herself a point on the card each time that she said something nice to a friend. That evening, she allowed herself to cash in her points with time on Facebook or YouTube. The more points she earned, the more time she could enjoy Facebook or YouTube. Erin’s points were called tokens-conditioned reinforcers that can be accumulated and exchanged for goods and services (Hackenberg, 2009).
