There is in fact a whole range of cases known to the untrained psychological observer in which sacrifice not only heightens the value of the goal, but even generates it by itself. What comes to expression in this process is the desire to prove one's strength, to overcome difficulties, indeed often to oppose for the sheer joy of opposition. The detour required to attain certain things is often the occasion, often the cause as well, of perceiving them as values. In human relationships, most frequently and clearly in erotic relations, we notice how reserve, indifference, or rejection inflames the most passionate desire to prevail over these obstacles, and spurs us to efforts and sacrifices which, without these obstacles, would surely seem to us excessive.

XREF: Connects to the 'effort justification' concept in cognitive dissonance research (Festinger), and to romantic psychology where scarcity inflames desire.

XREF: Connects to the scarcity principle in Cialdini and the idea that difficulty enhances perceived value — also foreshadows modern psychology of reactance. SEED: Potential angle: how artificial friction and barriers in product design and gamification manufacture desire by making rewards feel earned.

Georg Simmel, on individuality and social…, loc. 242