There are many professionals who provide their services against payment of their fee. Thus,
all types of services are special skills provided in exchange of payments. Health, education,
law, governance and recreation, etc., require professional skills. These services require other
theoretical knowledge and practical training. Tertiary activities are related to the service
sector. Manpower is an important component of the service sector as most of the tertiary
activities are performed by skilled labour, professionally trained experts and consultants. In
the initial stages of economic development, larger proportion of people worked in the
primary sector. In a developed economy, the majority of workers get employment in tertiary
activity and a moderate proportion is employed in the secondary sector.