一極集中
いっきょくしゅうちゅう
overconcentration (esp. of population, cultural and political institutions, etc. in Tokyo)
一極 is read as いっきょく (ikkyoku) and means monopole.
いっきょく
ikkyoku
いっきょくしゅうちゅう
overconcentration (esp. of population, cultural and political institutions, etc. in Tokyo)