IN 2009, the G20—a group of the world's largest economies—edged out the G8 as the pre-eminent forum for tackling the world's economic ills. Advanced economies, which aggressively stimulated demand and are forecast to experience weak GDP growth next year, contrast starkly with the G20's developing countries. After some gentle fiscal stimulus, these countries are on track for strong growth next year. The IMF forecasts that gross government debt among advanced economies will continue to rise until 2014, reaching 114% of GDP, compared to just 35% for developing nations. With governments struggling to rein in their finances, rating agencies are becoming increasingly twitchy; rich countries such as America and Britain are fearful of losing their hallowed triple-A status.