The leader of the small Constitutional Democratic Party of Japan, which exceeded expectations in October's snap poll, now hopes that by offering clear policy alternatives he can oust Prime Minister Shinzo Abe's ruling coalition in the next election.

One key to achieving that ambitious goal, said party founder Yukio Edano, is an economic platform that puts more weight on redistributing wealth, including by raising corporate taxes to push firms to use their cash reserves to raise wages.

"Unless we have reasonable redistribution to achieve growth, domestic demand will not expand," Edano, 53, said in an interview.