I agree with this. Since reading your book, I’ve been trying to find nudges for my two boys – 5 and 3 years old.
One thing I did was for the 5 year old. He doesn’t respond to time-outs for correcting behavior. Every morning he gets three coins put into a jar. When he isn’t behaving, I give him one warning that I will take money out of the jar. If he continues, I take a coin away. Repeat as needed. He is loss averse even though he doesn’t fully understand money yet. It doesn’t always work, but it is more effective at times than time-outs are.
Our 2 year old is already more hooked on TV than I’d like, and I have to admit my own part in it. It’s far too easy to just say yes when he asks and enjoy the 30 minute break of “TV as babysitter.” So, I’ve started keeping TV remotes in another part of the house, away from the TV. It’s not a huge hassle to get them, but it’s just enough work to get me to pause and say no more often.
(Yes, sometimes it’s us parents that need the nudging.)