I remember attending a talk by Dr Xavier Amador in which he described paying his brother $5 to take his meds.
There is a difference between rewards (positive reinforcement) and bribes.
You reinforce a behaviour but you bribe a person.
bribe /brīb/
verb: persuade (someone) to act in one’s favor, typically illegally or dishonestly, by a gift of money or other inducement.
re·in·force·ment /rēinˈfôrsmənt/
noun: the process of encouraging or establishing a belief or pattern of behavior, especially by encouragement or reward.
This can also be reversed in various ways like a punishment or financial disincentive, or in my case an added financial responsibility.
My mother started charging me rent some time after I started working full time. I resented it because the rule wasn’t applied consistently to all children, and I felt it delayed me saving up for my own apartment.
In hindsight she was doing me a favor. I think the lesson is creativity in incentives and disincentives can be rewarding, but I think it’s important to design them well and stick to your guns.