(a) The value of final goods and services produced in each sector during a particular year provides the total production of the sector for that year. And the sum of the production in the three sectors is called the Gross Domestic Product or GDP.
(b) The task of measuri.ng GDP is undertaken by a Central Government ministry. The
ministry with the help of various government departments of all the Indian states and union territories, collects the information relating to the total volume of goods and services and their prices and then estimates the GDP.
(c) The GDP of a country shows the size of the economy of the country. This reflects whether the country is poor or rich and the status of employment and people.

Three differences between the intermediate and final goods are as mentioned below:
Intermediate goods”-
(i) Intermediate goods are used up in producing final goods and service. The value of final goods includes the value of all the intermediate goods that are used in making the final goods.
(ii) Intermediate goods are not included in GDP to avoid the problem of double counting.
(iii) Wood is a intermediate good in the manufacturing of furniture.
Final goods:-
(i)These goods are used for final consumption.
(ii) Final goods are included in GDP.
(iii) Furniture and machines are final goods.

(a) Economic activities : Activities which generate income are called economic
activities e.g., to do business, to work in a bank etc.
(b) Sectors of economic activities : The economic activities are classified into three
sectors which are given below:
(i) Primary sector : All activities that are associated With land and water such as farming, rearing of cattie, hunting, fishing etc. fall in the category of primary sector. It is primary activity because it forms the base for all other products that are subsequently made. It is also called agricultural and related sector” because most of the natural products are got from agriculture, dairy, and forestry etc.
(ii) Secondary sector : Primary goods are used to produce some other commodities
manually or by machines in a workshop or at home. Such activities fall under the secondary, sector. As the products are made or manufactured, this process is called manufacturing. Since this sector is associated with different kinds of industries, it is called industrial sector also. In this sector manufacturing is done in factories. For example, yarn is manufacturing to weave from cotton cloth.
(iii) Tertiary sector : For primary and secondary, activities. there is a need for support services i.e., transport, store houses, banking etc. which are called tertiary activities. these are the activities that help in the development of primary and secondary sectors. For example, manufactured goods need to be transported by trucks or trains and then sold in the market. Sometimes goods are stored in god owns. We need communication system to interact with each other’ These activities are called service activities also because they generate than goods’ Teachers, doctors, washermen, ATM. booths. call centres fall under this category.