Question

describe why induastries are classified into three parts

Answer 1

Answer:

In a Nutshell

According to the three-sector theory, all economic activity can be classified into one of three sectors: the primary sector, the secondary sector and the tertiary sector. ... The primary sector describes all industries that are engaged in the extraction of natural resources or the production of raw materials.

Answer 2

Answer:

At the top level, industry is often classified according to the three-sector theory into sectors: primary (extraction and agriculture), secondary (manufacturing), and tertiary (services). Some authors add quaternary (knowledge) or even quinary (culture and research) sectors