Buenos Aires is the financial, industrial, and commercial hub of Argentina. The economy in the city proper alone, measured by Gross Geographic Product (adjusted for purchasing power), totaled US$84.7 billion (US$34,200 per capita) in 2011 and amounts to nearly a quarter of Argentina's as a whole. Metro Buenos Aires, according to one well-quoted study, constitutes the 13th largest economy among the world's cities. The Buenos Aires Human Development Index (0.867 in 2018) is likewise high by international standards.