[ecmendenhall]

Money might buy "freedom from depression," but I suspect it does so by buying antidepressants and therapy.

I think Robert Sapolsky is on to the best explanation of depression: it's a disease rooted in biology and genetics, similar to (and exacerbated by) chronic stress. (Here's a lecture that I'm sure has been posted here before: https://www.youtube.com/watch?v=NOAgplgTxfc). Reducing stress can alleviate the symptoms, but really effective treatments treat depression as a disease.