Based on GDP figures around 2006-2007, the ranking of the listed countries by the size of their economy (in nominal USD) was: 1. United States of America (USA) - The largest economy in the world. 2. China - The second-largest economy globally and growing rapidly. 3. United Kingdom (UK) - A large developed economy, significantly smaller than the USA and China. 4. India - A large and growing economy, but significantly smaller than the UK, China, and USA in nominal USD terms at that time. Therefore, the correct order in descending size is USA > China > UK > India.