The Ishin Party in Japan recently publicized the criteria necessary to designate a 'Secondary Capital'. This progressive movement aims at decentralizing administrative functions, in order to help develop regional areas and alleviate the heavy dependence on Tokyo. While the exact city for the proposed 'Secondary Capital' has not been disclosed, the criteria include economic potential, infrastructure, population, and disaster resilience.

Japan has been grappling with the issue of over-centralization in Tokyo for years, affecting socio-economic balance across the country. The initiative by Ishin, then, carries significant relevance. The notion of a 'Secondary Capital' has sparked a public discussion about urban development and strategic distribution of government resources across Japan.

The concept of a secondary or alternate capital doesn't strictly exist in the U.S. or EU. However, there are instances of power distribution among multiple cities. In the U.S., for instance, while Washington D.C. is the capital, New York City is the financial hub, and Los Angeles is seen as the entertainment center. The EU adopts a similar multi-polar approach with Brussels as the administrative hub but other cities like Paris, Berlin, and London having distinctive roles.