Kolkata is the prime business, commercial and financial hub of eastern India and the main port of communication for the North East Indian states. Kolkata is the third largest economy in India after Mumbai and Delhi. Kolkata, with a GDP (PPP) of $150.1 billion is home to India's oldest, stock exchange company (bourse) – The Calcutta Stock Exchange. Kolkata is home to many industrial units operated by large public- and private-sector corporations; major sectors include steel, heavy engineering, mining, minerals, cement, pharmaceuticals, food processing, agriculture, electronics, textiles, and jute.