What they say

"As long as it works and it's in response to the G20 (infrastructure objectives), it is fine."

Christine Lagarde managing director of the International Monetary Fund, speaking as the G20 estimated that $70 trillion in new infrastructure is needed by 2030, but there is likely to be a $1 trillion a year shortfall, which would undermine world growth potential.

"It would be foolish, to my mind, for us to think of the AIIB as a competitor because there's no way that the money we provide for infrastructure is going to be enough for us to reach the goal of ending extreme poverty. So we very strongly welcome all the other participants. We would say, please, take advantage of our 70 years of experience in doing this kind of business, and let's see how we can work even more closely together."