Prime Minister Shinzo Abe's newly appointed regional revitalization minister, Kozo Yamamoto, has argued that the leader's Abenomics economic policy mix has not plateaued but is merely returning to its original form, one that combines financial and fiscal measures.

Last month, Abe compiled an economic stimulus package totaling ¥28.1 trillion, including government loans to private businesses and fiscal spending by local governments for public works projects.

Many economists believe Abe is now shifting more to fiscal measures as the Bank of Japan's ultraloose monetary easing, the centerpiece of his Abenomics polices, appears to be reaching its limit.