> For example; defaults may work and red-light thing may not work. Why place them both under the same bucket at all? Why not study them in isolation? And that'

> For example; defaults may work and red-light thing may not work. Why place them both under the same bucket at all? Why not study them in isolation? And that's exactly how these meta analyses work! If you look in figure 1, they break down nudges both by the kind of intervention and by the domain. Maybe some types of nudges are much better than others. And maybe nudges work much better for say food vs finance. Yes. Defaults have an effect, most other nudge types don't. But the domain doesn't matter much it seems.