The various sectors of the economy are closely related. Private and public sectors are the two sides of the economy without which the working of the economy becomes difficult.

Both these sectors are complimentary and supplementary to each other. Private sector depends upon public sector for the supply of various heavy machines, tools, transportation and communication as basic requirement of trade, commerce and industry.

Primary, secondary and tertiary sectors depend upon each other. Primary sector supplies raw materials to secondary sector and receives tools and equipments from it. Tertiary sector also depends on primary and secondary sectors. It supplies its services to both the sectors.

The balanced growth of the economy needs that all the sectors of the economy should have balanced development. The development of primary sector provides sound base for the development of secondary and tertiary sectors.

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Similarly, the development of secondary sector provides machines, tools and equipment’s for the development of primary sector. With the development of primary and secondary sectors, tertiary sector grows automatically.

Thus, all these sectors contribute to the economic development. At the initial stage, the contribution of primary sector is more than the contribution of secondary and tertiary sectors. Later on as the economy grows the share of secondary and tertiary sector enlarges.