One physical therapist is paid $20 per session. Another is paid $400 per week plus $20 per session in excess of 20 sessions per week. A third is paid $400 per week, plus $200 per week for having all paperwork completed and filed within 48 hours, plus $20 per session in excess of 30 sessions per week. How do the therapists' incentives to produce sessions compare? How do their incentives to complete paperwork differ?