Depression is also only one dimension of unhappiness. You might lose your wife and kids, but not be clinically depressed. Poor, uneducated people are also less

Depression is also only one dimension of unhappiness. You might lose your wife and kids, but not be clinically depressed. Poor, uneducated people are also less likely to seek help, though that may be accounted for in the studies you are referencing. I'd guess that the nature of unhappiness between educated high-achievers and uneducated people is quite different.