The Economist magazine asks this question in this week’s edition and reveals that:
São Paulo’s Gross Domestic Product and GDP per capita could be compared to Poland’s; while its population is similar (numerically) to Argentina’s
Rio’s GDP can be compared to Singapore’s, its GDP per capita, to Russia’s., and its population to Kazakstan.
Alagoas, the poorest state, according to the latest official statistics, has the GDP of Afghanistan, the GDP per capita of China and the population of Albania.
Rio Grande do Sul, generally considered a very rich state, has the GDP per person of…Gabon.
Check all the other states status in their infographic: