Economic Outlook - Largest city economies in the world in 2008 and 2025

Cities tend to be ranked in size according to their populations, but to assess the relative size of their economies we also need to take account of their average income per capita levels. Doing this in a consistent and comprehensive way at a global level is challenging, but in this extract from PwC's UK Economic Outlook - November 2009 we have combined data from a number of reputable sources (e.g. the OECD, the UN and the World Bank as well as national statistical agencies) to produce a ranking by GDP at Purchasing Power Parity (PPP) exchange rates of the largest 100 urban economies in the world in 2008.