This chapter provides an economic analysis of regional labour migration mechanisms within the sumo wrestling market. During the Edo period, Osaka sumo and Kyoto sumo were recognized by the shogunate, but following the Meiji Restoration, these sumo stables relocated to Tokyo. Industrial structural changes transformed Japan from an agriculture-centred society to one focused on industry and commerce, creating surplus labour in rural areas. Young men migrated to urban centres seeking employment opportunities, with the sumo world following similar patterns. The concentration of sumo stables in Tokyo generated agglomeration economies. The proximity of training facilities, supporters, and spectators enabled efficient talent development and market expansion. During the high-growth period, rural youth called ‘golden eggs’ flowed into Tokyo, with the sumo world riding this wave. Data analysis confirms that regions farther from Tokyo showed lower growth rates in wrestler supply before Showa Era. However, this trend reversed during the Showa Era, with increased recruitment from remote regions due to improved transportation networks and economic development. The chapter demonstrates how sumo’s labour market dynamics mirrored broader patterns of Japan’s economic transformation.