Top-10 World Most Expensive and Powerful Cities

London, EnglandGross domestic product (2005): $452 billionGDP (2020): $708 billionGrowth rate: 3%MasterCard Ranking: 1Population (2007): 8,567,000Purchasing power (NYC=100): 92%By 2020, London is expected to leapfrog Paris and become Europe's richest city as measured by GDP. London's 3% growth rate is high for a major city in the developed world. London is ranked as the No. 1 city on