Primary agricultural ... nature or from the primary sector. Secondary agricultural goods are treated products and preparations from primary agricultural goods. Together, these form the main definition ...

All industry is made up of four sectors that are a linked together like a chain: primary, secondary, tertiary and quaternary ... Industries in this sector turn raw materials from the primary ...

The economic returns for tertiary education graduates are the highest in the entire educational system – an estimated 17% increase in earnings as compared with 10% for primary and 7% for secondary ...