Capitals, typically the richest metropolitan areas, recorded per capita GDP 37% higher than national per capita GDP, on average.
OECD metropolitan areas (i.e., urban areas with population of greater than 500 000) account for 55% of the total OECD population, 59% of the employed, and around 60% of the total GDP in the OECD area. However, with respect to GDP, different patterns are observed across continents. While metropolitan areas represent on average less than half (48%) of total GDP in European OECD countries, they generate two-thirds (66%) of national GDP in OECD countries in Asia and the Americas ( 4.6).