[eavc]

>Scarcity produces unhappiness

Beyond a basic level, this fails to be true.

>which in term induces human productivity/creativity.

Show me that depression leads to greater productivity. I expect that you cannot.

>climb the social/professional ladder to get what it is that you couldn't get in the first place.

This has nothing to do with depression and little to do with happiness.

>All great literature, music, scientific discoveries were of products of unrequited love, jealousy, or the urge to overcome a self-inferiority complex.

This is trite, wildly hyperbolic, and almost certainly baseless.