Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The tertiary sector of economy (also known as the service sector or the service industry) is one of the three economic sectors, the others being the secondary sector (approximately manufacturing) and the primary sector (extraction such as mining, agriculture and fishing). The general definition of the tertiary sector is producing a service instead of just an end product, in the case of the secondary sector. Sometimes an additional sector, the "quaternary sector", is defined for the sharing of information (which normally belongs to the tertiary sector).
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