"Chemical imbalance" is not only a marketing phrase. Lots of people are willing to receive treatment for a "chemical imbalance," but aren't willing to engage in

"Chemical imbalance" is not only a marketing phrase. Lots of people are willing to receive treatment for a "chemical imbalance," but aren't willing to engage in therapy, or admit they're depressed. This was very common in the last couple decades prior to the turn of the century, when mental illness was much more stigmatized than it is now.