Japan on course to elect woman prime minister in landmark first

In the past twenty years, Japan has seen over ten prime ministers.

In fact, one expert likens assuming the nation's top job to drinking from a "cursed cup".

But why does Japan frequently replace prime ministers? It's due in part of it being a "one-party democracy", explains Professor James Brown of Temple University in Japan.

The Liberal Democratic Party's control on the political landscape means the main political competition originates inside the party, instead of from external parties.

"So within the LDP there are vicious struggles within different factions - they all desire their own faction to get the top job."

"So even though you might be selected as leader, the moment you're in power, you have many individuals scheming to try to remove you again."

Main Reasons Behind Frequent Changes

• One-party dominance restricts external competition
• Party infighting fuel power struggles
• The leadership role is frequently called a "poisoned chalice"
• Political stability remains elusive despite financial power