All industry is made up of four sectors that are a linked together like a chain: primary, secondary, tertiary and quaternary ... consultancy, project management, education and research and ...

In economics, there are four big sectors. They include the primary, secondary, tertiary, and quarternary sectors, each of which has many sub-sectors. In the financial markets, economic sectors are ...

Primary agricultural goods are untreated products which come directly from nature or from the primary sector. Secondary agricultural goods are treated products and preparations from primary ...