Japan on course to elect woman prime minister in historic first

In the past twenty years, the country has had over ten leaders.

In fact, one expert compares assuming the country's highest office to taking a "cursed cup".

However, what is the reason does the country frequently replace prime ministers? This is partly because of it being a "single-party system", says Prof James Brown of Temple University Japan.

The Liberal Democratic Party's control on the political landscape means the main political competition comes from inside the party, instead of from opposition groups.

"So within the LDP there are intense conflicts within different factions - they all want their own faction to get the top job."

"Thus although you could be selected as leader, the moment you're in power, you have many individuals manoeuvring to try to get you out again."

Key Factors Behind Frequent Changes

• Single-party rule restricts external competition
• Party infighting fuel power struggles
• The leadership role is frequently called a "cursed position"
• Government continuity stays difficult to achieve despite financial power