Comparing the sectorsUnlike the primary or manufacturing sectors that make up the rest of the economy, the service sector does not create any goods, nor extract or grow any materials. Instead, it is made up of industries that provide services to their customers. For example, the transportation and warehousing industry doesn't create any products and it doesn't mine or extract any usable raw materials from the ground. However, the goods that are produced or gathered within the other sectors of the economy are transported and stored by shipping companies that deliver them to their customers all over the country. This service, like many other industries, adds value to the trade of products and contributes to the overall economy of the United States.
As a whole, the improvement of modern technology has given growth to the service sector, making it increasingly valuable. In fact, the service sector tends to add more value to the Gross Domestic Product (GDP) of the United States than the other two sectors of the economy. However, there is still some dispute as to which industries should be included in this calculation. Some industries seem to switch sector classification from one institution to the next. For example, the United States Bureau of Economic Analysis (BEA) classifies the construction industry as a production industry. In their reports, it can be found with the goods-producing industries and its contribution to the GDP is added to the manufacturing sector's value. On the other hand, the Institute for Supply Management (ISM) considers construction to be a part of the service sector.