K-pop craze: Why the spectacular comeback of BTS has held behavioural economists in its thrall

The recent release of Korean group BTS’s Arirang album looks less like a musical comeback after a break and more like a case study in the strategic manipulation of consumer psychology. While publicists have framed the group’s return from a mandatory hiatus for military service as a cultural restoration, a closer analysis suggests a masterclass in behavioural economics.BTS’s comeback is projected to inject billions of dollars into the global economy.

This cannot be explained by traditional economics alone, as it reflects an interplay of the ‘expectation effect’, theory of ‘intertemporal choice’ and the ‘scarcity heuristic.’ At the heart of the Arirang phenomenon is the expectation effect—a cognitive bias where anticipation reshapes perceived experience. Neuroscience research shows that prior beliefs can activate the brain’s reward circuitry even before a stimulus is encountered.

For the BTS ‘ARMY’ (its fandom), the seven-member group’s three-year hiatus functions as a powerful expectation setter. The portrayal of its return to live concerts, etc, anchored in Arirang, Korea’s unofficial national anthem, preconditions listeners to perceive the music as culturally and artistically superior.

This operates much like a high-stakes placebo effect. As found in 2008 wine experiments (shorturl.at/oxVD0), raising the price of wine significantly increased the reported value of the experience; similarly, the emotional ‘cost’ of the wait-time raises the BTS album’s perceived utility.

Standard economics relies on exponential discounting—the idea that individuals prefer immediate rewards and the value of a reward decays the longer one has to wait for it. However, BTS’s management, HYBE, appears to have engineered a ‘negative discount