It has to be said that the G20 is not a totally new informal institution. It actually came into being at the end of the 1990s as a reaction to the Asian crisis and also proved to be very useful at that time. But now it has made a clear jump in quality, complementing very significantly the G7 or the G8.
So, the meeting in London was a very important, historic occasion. Many decisions were taken: new financial rules, new money for the International Monetary Fund, a new, more structured set-up for the Financial Stability Forum. Which are the most important? I would not focus on one particular measure. They are all important and are viewed together.