Kumbh Mela is the largest human gathering in the world. While much is spoken about its cultural and spiritual significance, Kumbh is equally fascinating as a study in spontaneous economic systems. Kumbh occurs every few years at four rotating locations in India—Allahabad (Prayagraj), Haridwar, Ujjain and Nashik, with the 2019 Prayagraj Kumbh attracting a record 24 crore visitors. The scale of Kumbh, especially in modern times, offers a unique insight into the economics of large-scale, transient gatherings. On a peak day with 3 crore visitors, the Kumbh economy can rival the size of cities like Delhi or Mumbai.