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Core industry can be defined as the main industry. In most countries, there is a particular industry that seems to be the backbone of all other industries and it qualifies to be the core industry.
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In India, there are eight core sectors comprising of :
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Refinery products (28.04%)
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Electricity (19.85%)
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Steel (17.92%)
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Coal (10.33%)
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Crude oil (8.98%)
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Natural gas (6.88%)
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Cement (5.37%)
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Fertilisers (2.63%).
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These eight Core Industries comprise nearly 40.27% of the weight of items included in the Index of Industrial Production (IIP), which measures factory output.
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Index of Eight Core Industries is released by Ministry of Commerce and Industry.