If I may suggest one more cause for this, to the list of all the other causes suggested by everyone:<p>I think this rise in collective depression may also be due to the fact that more and more people live their entire life inside cities, from birth to death, with little or no contact with “nature” at all.<p>All we ever get to interact with are artificial institutions, created by other humans just as fallible as us..<p>Like building ever smaller boxes inside existing boxes, few people ever get the chance to break out and discover their true potential, let alone achieving that potential.