G20 summit: 'China cannot go it alone' on world economy

China is hosting the G20 summit, where it hopes to increase its say in running the global economy.

But Beijing understands "dominance will not create a great leader", says a senior Chinese banker.

Jin Liqun, the head of the new Asian Infrastructure Investment Bank (AIIB), talks with the BBC's China editor Carrie Gracie about the country’s growing leadership role.

He starts with President Xi Jinping's plea that the G20 should do more to defend free trade.