Economic activities can be divided into three sectors – the primary sector associated with the use of natural resources, the secondary sector concerned with the processing of raw materials into products and goods, and the tertiary sector associated with service production for the benefit of the other two sectors. All three sectors are interdependent to each other. For example, cultivation of sugarcane is a primary sector activity. Processing of this sugar cane in factories to produce sugar is a secondary sector activity. Transferring of the sugarcanes to the factories and marketing and selling of the finished product (sugar) is a tertiary sector activity. Thus, the primary sector is dependent on the secondary sector for payment for the sugarcane produced. The secondary sector is dependent on the primary sector for supply of raw materials to keep up continuous production. Both these sectors are dependent on the tertiary sector for the transportation, marketing and selling of both raw materials and finished goods.