2 ms·

The jobs you listed are all information worker jobs. Service jobs are things like hairdresser, waiter, receptionist, etc.

• karpierz 7y ago
  The parent poster is referring to the three-sector model of the economy: primary (resource extraction, agriculture), secondary (manufacturing, processing), tertiary (services). Education, R&D, knowledge workers, secretaries all fall under this.
  • airstrike 7y ago
    Thank you