HEAVY INDUSTRY Heavy industry, group of companies, or productive organizations that produce or supply goods, services, or sources of income. In economics, industries are generally classified into primary, secondary, tertiary, and quaternary; Secondary industries are further classified as heavy and light.
Primary industry The primary industry tends to dominate the economies of underdeveloped and developing nations, but as secondary and tertiary industries develop, their share in economic output tends to decline.
Secondary industry Secondary industry can be divided into the heavy or large-scale industry and light or small-scale industry. The large-scale industry generally requires a large capital investment in plant
Tertiary industry This broad sector also called the service industry includes industries that, although they do not produce tangible goods, provide intangible services or profits or generate wealth.
Quaternary industry An extension of the tertiary industry that is often recognized as its sector, the quaternary industry, deals with informationbased or knowledge-oriented products and services.
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