2000년 7월 분권형사회를 위한 지방세 재정방안을, 2003년에는 간사이 광역연합을 가정한 간사이 모델을 각각 제안하였다.
In July 2000, a local tax fiscal plan for a decentralized society was proposed, and in 2003, a Kansai model was proposed which became the Union of Kansai Governments, respectively.