Botanical Survey of India and Zoological Survey of India and many more organisations and companies.Kolkata is 3rd richest City in India after Mumbai & New Delhi , & also the 3rd richest City in South Asia. Kolkata is home to many industrial units operated by large public sector and private-sector corporations; major sectors include steel, heavy engineering, mining, minerals, cement, pharmaceuticals, food processing, agriculture, electronics, textiles, and jute. Sectors Flexible production has been the norm in Kolkata, which has an informal sector that employs more than 40% of the labour force. Over the years, the informal sector has grown in size and as a proportion of the total workforce of the Kolkata metropolitan area. One unorganised group, roadside hawkers, generated business worth 87.72 billion ( 2 billion) in 2005. , around 0.81% of the city's workforce was employed in the primary sector (agriculture, forestry, mining, etc.); 15.49% worked in the secondary sector (industrial and manufacturing); and 83.69% worked in the tertiary sector (service industries). , the majority of households in slums were engaged in occupations belonging to the informal sector; 36.5% were involved in servicing the urban middle class (as maids, drivers, etc.), and 22.2% were casual labourers. About 34% of the available labour force in Kolkata slums were unemployed. According to one estimate, almost a quarter of the population live on less than 27 rupees (equivalent to 45 US cents) per day. Since 2017, warehousing industry in the vicinity of the city experienced significant increase, and was the fastest growing market in India, per 2019 report. Major Companies based in Kolkata 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. Companies such as ITC Limited, ABP Group, CESC Limited, Exide Industries, Emami, Eveready Industries India, Lux Industries, Rupa Company, Berger Paints, Patton International Limited, Birla Corporation, Khaitan India Ltd., Peerless Group and Britannia Industries, Jai Balaji group, Shyam Steel Industries Limited are all headquartered in the city. Philips India, PricewaterhouseCoopers India, Tata Global Beverages, Tata Steel have their registered office and zonal headquarters in Kolkata. Some of the oldest public sector companies are headquartered in the city such as the Coal India Limited, National Insurance Company, Garden Reach Shipbuilders & Engineers, Tea Board of India, Geological Survey of India, Zoological Survey of India, Botanical Survey of India,