With economies around the world at a critical moment, expectations for the London Summit on 2 April are running high. However, there is a limit to what the G20 can realistically achieve.
A panel of experts ask what the leaders' key priorities should be - boosting demand, halting protectionism, reforming the IMF or agreeing new rules for international financial regulation?
Dr Youssef Boutros-Ghali is Minister of Finance of Egypt and Chairman of the International Monetary and Financial Committee (IMFC) of the IMF.
Mark Malloch Brown
Mark Malloch Brown has served as Deputy Secretary-General of the United Nations since April, 2006. Before his current appointment, he was the Secretary-General's Chef de Cabinet since January 2005. In that position, he worked closely with the Secretary-General and the Deputy-Secretary General on all aspects of UN work, including helping to set out an ambitious reform agenda for the United Nations, much of which was endorsed by world leaders at the World Summit in New York last September.
Prior to becoming Chef de Cabinet, Mr. Malloch Brown served as Administrator of the United Nations Development Programme (UNDP), the UN's global development network, from July 1999 to August 2005. During that time, he was also the Chair of the United Nations Development Group, a committee consisting of the heads of all UN funds, programs and departments working on development issues.
Dr. Robin Niblett
Robin Niblett is the Director of Chatham House, President of The Center for Strategic and International Studies, former director of the CSIS Atlantic Partnership Project, and co-editor of Rethinking European Order: West European Responses, 1989-97.
Dan Price is Senior Partner for Global Issues at Sidley Austin.
Stephen S. Roach
Stephen S. Roach is Managing Director and Chief Economist of Morgan Stanley, a leading global financial services firm. In this role, he oversees the Firm's team of economists located in New York, London, Frankfurt, Paris, Tokyo, Hong Kong and Singapore.
Before joining Morgan Stanley in 1982, Mr. Roach was Vice President for Economic Analysis for the Morgan Guaranty Trust Company in New York.
He also served on the research staff of the Federal Reserve Board in Washington, D.C. from 1972-79 - where he supervised the preparation of the official Federal Reserve projections of the U.S. economy. Prior to that, he was a research fellow at the Brookings Institution in Washington, D.C.
Paola Subacchi is research director if international economics at Chatham House.
Stephen Roach, chairman of Morgan Stanley Asia, says that adherence to Keynesian economics has created an imbalance of spending over savings, and a worse economic crisis could be looming if balance is not restored.
Youssef Boutros-Ghali argues that any reforms agreed upon during the G20 summit in London must be folded into the IMF because, backed by international treaty, it will have the authority and legitimacy to carry out reform.
Lord Malloch-Brown, Prime Minister's special envoy for the G20 London summit, stresses that this year's summit in London is more important than ever because the financial crisis has gone "way beyond markets."
Rich or poor, it's about "the uncertainty all of us feel," he says.