HONG KONG — Amid great fanfare, pestered by a rainbow alliance of protesters, and protected by almost blanket security costing $30 million for a mere seven hours of meetings and making London a virtual no-go area, the leaders of the Group of 20 (G20) countries meet this week, promising to restore hope and prosperity to a world battered and bruised by financial and economic crises.

Unfortunately, there are too many doctors already squabbling over the diagnosis and which medicines to take, vitamins or antibiotics, starvation or a rich diet, energy boosters or that new but expensive wonder drug that might have damaging side effects; moreover, the doctors are going to have to take some of their own medicine, and they don't like that at all.

There are many good reasons for the world's top economic powers to come together, not least because the global economy has fallen off the proverbial cliff edge. In October, Dominique Strauss-Kahn, the managing director of the International Monetary Fund (IMF), was more pessimistic than his own economists, but all scorned the idea that the world as a whole would fall into recession. Indeed, the economists expected positive growth of 3 percent, thanks to rapidly growing developing countries like China and India.