My qualms here are, first, that her rules are actually natural, first principles, applications of economic logic but, second, for reasons that relate to the failings of that logic, are unlikely to be of use for many parents.
Too many changes have happened to society and the world we live in for a 50-year-old to be able to relate to a 15-year-old and the stock put-down phrase adopted by all kids "you wouldn't understand" is perfectly appropriate - though very unwelcome at any age.
This may reflect actual differences in depression rates, but it could also be that people in poorer countries are for some reason less likely to recall or relate episodes of depression from their past, the authors say.