Mumbai being the largest city of India, capital of Maharashtra and one of the most populous cities in the world with
current estimated population of about 12.4 million it is the world’s 37th largest city by Gross Domestic Product (GDP). As of
2019, recent estimates of the economy of the Mumbai Metropolitan Region have ranged from 3.16 lakh crore (US$44 billion)
(2019–20 est.) 4.04 lakh crore (US$57 billion) (2019–20 est.) ranking it either the most or second-most productive metro area of
India.