Narcissism is structurally an imbalance in allocating scarce libido

Evidence

For Freud, such wasting unto death connotes an imbalance, so balance or equilibrium becomes one of the defining questions of narcissistic structure. Freud hypothesized that human subjects have a kind of scarcity of libido, and that narcissism rests in overallocating libido inward to the self and underallocating outward to the other. — Anna Kornbluh, Immediacy, or The Style of Too Late…, 88