Functional interrelationship is often considered in the various stages of economic production. This functional interrelationship is related to secondary and tertiary productions through various services in the field of economic geography. The direct or indirect functional relation of all the resources of production depends upon the location, land formation, surface, climate, soil and technical know-how of those areas. In the same way, cattle-grazing depends upon the climate; vegetation and availability of water in those areas. Forestry though a means of production, depends upon climate and the nature, thickness of growth, supply and type of vegetation. In the same way the production of minerals too depends upon the amount of deposit, location, climate, means of transport and technical knowledge of man.
Just as the various aspects of primary production have functional interrelationships with one another, in the same way, all the factors of secondary production have established functional relation with the factors of primary production. In secondary production, although matter is used after its transformation, but secondary production is not possible until raw material is obtained from primary production. For example, the making of paper is considered secondary production, but the secondary production is not possible until material is obtained for it from the forests. And making of steel is not possible until the mineral ore for it is obtained. In the same way tertiary production has functional relation with the primary and secondary production. Production of steel from iron is not possible without its technical knowledge. Thus these nine M's of production - Money, Material, Man, Market, Machinery, Motive Power, Means of transportation, Management, Means of Momentum of early start - show their functional interrelationship directly and indirectly.
The functional interrelationship of production not only changes the forms and utility of material but also effects a transformation in their ownership and value. A rise in prices to result from the transformation of production and utility. The functional interrelationships of production result in a functional interrelationship in locations, which serve as linkages. These are, in fact, called areal functional interrelationships.
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